Production method of wheel coated with chameleon paint

Abstract

The invention belongs to the technical field of coating, and relates to a method for producing a wheel coated with a chameleon paint, which comprises the following steps of: firstly, degreasing, pickling, passivating pretreatment and spraying ash base powder to cover surface defects, and the film thickness is 60-120 microns; then primer is sprayed on the double stations and leveling is carried out; secondly, when the chameleon paint is sprayed, the distance between the spray gun and the surface of the wheel to be sprayed is 150-250 mm, then clear paint is sprayed on the double stations, and finally baking and curing are conducted for 35-45 min at the temperature of 140-150 DEG C; on the basis of an existing wheel spraying process, the surface of the wheel is coated with the chameleon paint, mainly the chameleon paint and the temperature change paint, so that the individual requirements of consumers are met. According to the spraying process, on the basis of conventional spraying, the measures of double-station uniform spraying, proper prolonging of leveling time, additional spraying of noctilucent paint and the like are taken, so that the surface of the wheel obtains a rich and colorful visual effect finally, and the wheel is extremely personalized.

Description

Technical Field

[0001] The invention belongs to the technical field of coating, relates to the production of coated wheels, and in particular to a production method of wheels coated with color-changing paint. Background Art

[0002] At present, due to the popularization of the concept of pursuing personalization, many customers hope that the wheels of their cars have a colorful visual sensory experience. In the existing coating process, the spraying materials of car wheel paint are mostly single colors or a combination of multiple single colors. Although the overall appearance of the wheel is colorful, it will not change with different viewing angles and changes in the external ambient temperature.

[0003] Color-changing paint is a paint that changes color with different viewing angles and different external environments. It can generally be divided into two types: one is chameleon paint, in which the wheel presents different colors as the angle of observation of the wheel changes; the other is temperature-variable paint, in which the color of the wheel changes with the ambient temperature.

[0004] Chameleon paint is a synthetic inorganic pigment made of a natural mica thin skin covered with metal oxides, and the coating thickness of various inorganic oxides is precisely controlled through multiple layers of coating. The color-changing principle of chameleon paint is to absorb a light source of a specific wavelength. The different wavelengths caused by the different light sources from each direction of the reflection surface, the energy of the light source produces a change in color, and the colors seen at different angles will also be different. Just like chameleons in nature, they will have different colors when they are under different light sources and observed from different directions. Chameleon paint color paste has good waterproof and weather resistance and good dispersibility. It can be used with water-soluble and solvent-soluble coatings to make car wheels colorful, creating a new color expression effect, giving many car enthusiasts and consumers a refreshing sensory experience.

[0005] Temperature-changing paint, also known as reversible color-changing paint, is mainly composed of compounds or complexes of heavy metals such as mercury, copper, silver, and lead as temperature-sensitive pigments, and oil-based varnish, transparent paint, urea transparent paint, melamine resin mixture, etc. as binders. The temperature-changing mechanism is caused by the change of the crystal form of the temperature-sensitive pigment or the change of pH value. For example, the change of the crystal form of HgI2 at 125°C is from red to flesh color. When the pH value of octanoic acid (with BPB) changes from large to small at 80-90°C, the color changes from yellow to red. The general temperature measurement range is 50°C, 70°C, 130°C, and 170°C. Commonly used are the complex salt compounds of silver iodide and mercuric iodide, with the molecular formula of 2AgI·HgI2 and the complex salt compounds of copper iodide and mercuric iodide, with the molecular formula of 2CuI·2HgI2. Taking the first type as an example, the preparation method is to use 1 to 3 parts of mercuric iodide and 10 parts of silver iodide (by weight), mix and stir evenly, add transparent spray paint to make a paste, and then add a small amount of diluent to dilute it before applying it. Increasing the weight ratio of mercuric iodide (within the range of 1 to 3 parts) can reduce the starting temperature of color change and increase the color depth after color change. Temperature-variable paint generally appears yellow at room temperature, starts to change color above 30°C, appears orange at 45°C, and begins to appear red-orange at 65°C. The higher the temperature, the darker the chroma. When the ambient temperature drops, the color will change accordingly, so that it returns to the original yellow. Due to repeated color change and use, temperature-variable paint has higher requirements for the heat resistance and storability of the binder.

[0006] In the existing coating process, the spraying material of wheel paint is mainly a single color or a simple combination of multiple single colors. Although the finished wheel looks colorful, the color is fixed and will not change with the change of the observer's perspective or the change of the external environment temperature. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to disclose a production method for color-changing paint coated wheels.

[0008] Technical Solution

[0009] A method for producing a wheel coated with a color-changing paint comprises the following steps:

[0010] 1) The wheels are pre-treated by degreasing, pickling and passivation. Whether the pre-treatment is clean has a great influence on the performance and life of the paint film;

[0011] 2) Spraying gray base powder to cover surface defects, with a film thickness of 60 to 120 μm, can enhance adhesion, weather resistance and paint life;

[0012] 3) Spray primer at double station, the primer viscosity is 14-18 seconds (apply - 4 cups), the film thickness is 15-20μm, and it is leveled after spraying, the leveling temperature is 20-60℃, and the leveling time is 5-8min;

[0013] 4) When spraying the color-changing paint, the spray gun is 150-250mm away from the wheel surface to be sprayed. First, spray a layer of color-changing paint at the first station with a film thickness of 10-15μm. After 5-10s, spray the second layer of color-changing paint at the second station with a film thickness of 10-15μm. The paint is leveled after spraying at a temperature of 20-60℃ and a leveling time of 5-8min.

[0014] 5) Spray transparent paint at the double station with a viscosity of 16 to 20 seconds (apply - 4 cups) and a film thickness of 15 to 20 μm to increase the surface gloss, making the color-changing paint surface brighter and lasting longer;

[0015] 6) Bake and cure at a temperature of 140-150°C for 35-45 minutes to allow the paint to fully bond and fix the color.

[0016] In the preferred disclosed example of the present invention, in step 3), when chameleon paint is subsequently sprayed, the primer is a black primer; when reversible color-changing paint is subsequently sprayed, the primer is a white primer.

[0017] In the preferred disclosed example of the present invention, in step 3), the leveling process is to allow the primer to have sufficient leveling time, otherwise it is easy to wrinkle or even peel off the infiltrated primer. The color-changing paint can be sprayed only after the primer surface is dry.

[0018] In the preferred disclosed example of the present invention, in step 4), after the primer is leveled, luminous paint can also be sprayed. The luminous paint should be fully stirred and evenly mixed. The luminous paint is a mixture of pigment, resin liquid and luminous powder. From manufacturing to use, there is a period of time between which it is inevitable that the pigment or luminous powder will separate and precipitate. Therefore, it should be fully stirred and evenly mixed before use.

[0019] In the preferred disclosed example of the present invention, in step 4), when spraying the color-changing paint, the color-changing paint is adjusted to a construction viscosity of 14 to 18 seconds (apply - 4 cups) with a matching diluent.

[0020] In the preferred disclosed example of the present invention, in step 4), the movement speed of the spray gun is 30 to 60 cm / s, maintaining a uniform motion.

[0021] In the preferred disclosed example of the present invention, in step 4), when spraying the second coat of color-changing paint, it should be cross-linked with the first coat of coating film vertically and horizontally, that is, if the first coat is sprayed horizontally, the second coat should be sprayed vertically.

[0022] When mixing chameleon paint, the base materials of the color paint used must be the same, otherwise it will cause resin precipitation, floating color, sedimentation, and even scrap. When mixing colors, pay attention to the cleanliness of the mixing site, fire safety, and prepare color matching containers, tools and testing instruments, such as clean stirring tools, standard color cards or samples, colorimeter, colorimeter, etc.

[0023] The deployment precautions are as follows:

[0024] 1) Consult the data, determine the main color and color composition of the color to be mixed based on experience or computer measurement, and prepare the materials before mixing the chameleon paint;

[0025] 2) According to the types and supply conditions of automotive chameleon paints available in the market, select the primary color pigments or color pastes of the chameleon paints required for the main color coating and color matching;

[0026] 3) Try to prepare a small sample first, first determine how many colors of the complex paint it contains, and then preliminarily determine the mass of the various color paints participating in the color matching, as a reference for the preparation of the large sample. The method of weight measurement is to put the chameleon color paints participating in the color matching into containers respectively, weigh their gross weight first, and weigh them again after the color matching is completed. The difference between the two weighings can be used to calculate the mass of the various color paints participating in the color matching;

[0027] 4) In the process of color matching, the color paint to be matched should be based on the color of the color paint to be matched, and a small amount of other color paint should be added slowly and intermittently, stirring continuously, taking samples at any time, and comparing with the sample. Only by patiently mixing can the matched color meet the requirements;

[0028] 5) When mixing paint, keep half of it as a backup. If you over-mix it, add more and mix it again carefully.

[0029] 6) If the sample is a dry sample, you need to wait for it to dry before comparing it. If time does not allow, you can judge whether the dried coating matches the original sample based on experience before it dries. If the sample is a wet sample, you can mix the sample chameleon paint liquid thoroughly, drop a drop of it next to the paint being prepared for comparison, and adjust and compare until it matches;

[0030] 7) After the small sample is matched, the amount of paint to be matched is preliminarily determined, and the large sample is matched according to the proportion of various paints involved in the paint matching, and the method is the same as above;

[0031] 8) When matching paint, it should be done on a sunny day or under a standard light source. Do not observe continuously when matching colors, let your eyes rest for a while before adjusting. When comparing paints, the paint must be fully stirred up and down each time, and then samples are taken for comparison, so as to reduce errors.

[0032] Precautions for spraying construction:

[0033] The quality of chameleon paint during spraying mainly depends on the viscosity of the chameleon paint, the working pressure, the distance between the nozzle and the surface of the object, and the technical proficiency of the operator. In order to obtain a smooth, flat, uniform coating, the correct operating method must be mastered during spraying.

[0034] A. Before spraying, the viscosity adjustment of the chameleon paint, the nozzle diameter, spray distance, pressure, etc. of the spray gun should be adjusted according to the spray gun usage instructions;

[0035] B. Use your ring finger and index finger to gently hold the gun handle, hook the trigger with your index finger and middle finger, and hold the gun handle in your thumb; when spraying, follow the spray gun with your eyes, and pay attention to the film formation and the drop point of the spray head at any time; the spray distance and vertical angle between the spray gun and the surface are controlled by the body, and the movement of the spray gun also requires the body to assist the movement of the arm, and the wrist cannot be moved, but the wrist must be flexible;

[0036] C When the spray gun is running, it should be kept at a right angle and parallel to the surface of the object being coated, and the distance between the spray gun and the surface of the object being coated should be between 20 and 30 cm;

[0037] During the construction of D Chameleon paint, the edge of each spray width should be repeated 1 / 3 to 1 / 2 on the edge of the previously sprayed width, and the width of the overlap should be kept consistent. If the width of the overlap varies, the film thickness will be uneven, and stripes and marks may occur;

[0038] E Each time the Chameleon paint is ejected, the spray gun trigger should be opened when the spray gun is moving, and the spray gun trigger should also be closed when the spray gun is moving. This can avoid excessive paint accumulation and sagging on the surface of the workpiece.

[0039] Beneficial Effects

[0040] Based on the existing wheel spraying process, the present invention adopts color-changing paint, mainly chameleon paint and temperature-changing paint, to paint the wheel surface to meet the personalized needs of consumers. The spraying process used is based on conventional spraying, and uses double stations, uniform spraying, appropriately extending the leveling time, and adding luminous paint to make the surface of the final wheel obtain a colorful visual effect, which is highly personalized. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the embodiments so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following embodiments.

[0042] Example 1

[0043] A method for producing a wheel coated with a color-changing paint comprises the following steps:

[0044] 1) The wheels are pre-treated by degreasing, pickling and passivation;

[0045] 2) Spraying base powder to cover surface defects, film thickness 60μm;

[0046] 3) Primer is sprayed at the double station, the primer viscosity is 14 seconds (apply - 4 cups), the film thickness is 15μm, and it is leveled after spraying, the leveling temperature is 20℃, and the leveling time is 5min;

[0047] 4) When spraying the color-changing paint, the spray gun is 150mm away from the wheel surface to be sprayed. First, spray a layer of color-changing paint at the first station with a film thickness of 10μm. After 5s, spray the second layer of color-changing paint at the second station with a film thickness of 10μm. The paint is leveled after spraying at a temperature of 20℃ and a leveling time of 5min.

[0048] 5) Spray clear paint at the double station, with a viscosity of 16 to 20 seconds (apply - 4 cups), and a film thickness of 15 μm;

[0049] 6) Bake and cure at 140°C for 35 minutes.

[0050] Example 2

[0051] A method for producing a wheel coated with a color-changing paint comprises the following steps:

[0052] 1) The wheels are pre-treated by degreasing, pickling and passivation;

[0053] 2) Spraying base powder to cover surface defects, film thickness 120μm;

[0054] 3) Primer is sprayed at the double station, the primer viscosity is 18 seconds (apply - 4 cups), the film thickness is 20μm, and it is leveled after spraying, the leveling temperature is 60℃, and the leveling time is 8min;

[0055] 4) When spraying the color-changing paint, the spray gun is 250mm away from the wheel surface to be sprayed. First, spray a layer of color-changing paint at the first station with a film thickness of 15μm. After 10s, spray the second layer of color-changing paint at the second station with a film thickness of 15μm. The paint is leveled after spraying at a temperature of 60℃ and a leveling time of 8min.

[0056] 5) Spray clear paint at double stations, viscosity 20 seconds (apply - 4 cups), film thickness 20μm;

[0057] 6) Bake and cure at 150°C for 45 minutes.

[0058] Example 3

[0059] A method for producing a wheel coated with a color-changing paint comprises the following steps:

[0060] 1) The wheels are pre-treated by degreasing, pickling and passivation;

[0061] 2) Spraying base powder to cover surface defects, film thickness 90μm;

[0062] 3) Primer was sprayed at the double station, the primer viscosity was 16 seconds (apply - 4 cups), the film thickness was 18 μm, and it was leveled after spraying, the leveling temperature was 40°C, and the leveling time was 6 minutes;

[0063] 4) When spraying the color-changing paint, the spray gun is 200mm away from the wheel surface to be sprayed. First, spray a layer of color-changing paint at the first station with a film thickness of 12μm. After 8s, spray the second layer of color-changing paint at the second station with a film thickness of 12μm. The paint is leveled after spraying at a temperature of 40℃ and a leveling time of 7min.

[0064] 5) Spray clear paint at double stations, viscosity 18 seconds (apply - 4 cups), film thickness 17 μm;

[0065] 6) Bake and cure at 145°C for 40 minutes.

[0066] Example 4

[0067] A method for producing a wheel coated with a color-changing paint comprises the following steps:

[0068] 1) The wheels are pre-treated by degreasing, pickling and passivation;

[0069] 2) Spraying base powder to cover surface defects, film thickness 60μm;

[0070] 3) Spraying primer at the double station, the primer is black primer, the primer viscosity is 14 seconds (apply - 4 cups), the film thickness is 15 μm, and leveling is performed after spraying, the leveling temperature is 20° C., and the leveling time is 5 minutes;

[0071] 4) When spraying chameleon paint, the spray gun is 150mm away from the wheel surface to be sprayed. First, spray a layer of chameleon paint at the first station with a film thickness of 10μm. After 5s, spray the second layer of chameleon paint at the second station with a film thickness of 10μm. The paint is leveled after spraying at a temperature of 20℃ and a leveling time of 5min.

[0072] 5) Spray clear paint at the double station, with a viscosity of 16 to 20 seconds (apply - 4 cups), and a film thickness of 15 μm;

[0073] 6) Bake and cure at 140°C for 35 minutes.

[0074] Example 5

[0075] A method for producing a wheel coated with a color-changing paint comprises the following steps:

[0076] 1) The wheels are pre-treated by degreasing, pickling and passivation;

[0077] 2) Spraying base powder to cover surface defects, film thickness 90μm;

[0078] 3) Spraying primer at the double station, the primer is a white primer, the primer viscosity is 16 seconds (apply - 4 cups), the film thickness is 18 μm, and leveling is performed after spraying, the leveling temperature is 40° C., and the leveling time is 6 minutes;

[0079] 4) When spraying reversible color-changing paint, the spray gun is 200mm away from the wheel surface to be sprayed. First, spray a layer of reversible color-changing paint at the first station with a film thickness of 12μm. After 8s, spray the second layer of reversible color-changing paint at the second station with a film thickness of 12μm. The paint is leveled after spraying at a temperature of 40℃ and a leveling time of 7min.

[0080] 5) Spray clear paint at double stations, viscosity 18 seconds (apply - 4 cups), film thickness 17 μm;

[0081] 6) Bake and cure at 145°C for 40 minutes.

[0082] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the specification of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for producing a wheel coated with a color-changing paint, characterized in that: The steps include: 1) The wheels are pre-treated by degreasing, pickling and passivation; 2) Spraying base powder to cover surface defects, the film thickness is 60-120μm; 3) Spray primer at the double station, the primer viscosity is 14 to 18 seconds, apply -4 cups, the film thickness is 15 to 20μm, and leveling is performed after spraying, the leveling temperature is 20 to 60℃, and the leveling time is 5 to 8min; 4) When spraying color-changing paint, the spray gun should be 150-250mm away from the wheel surface to be sprayed. First, spray a layer of color-changing paint at the first station with a film thickness of 10-15μm. After 5-10s, spray the second layer of color-changing paint at the second station with a film thickness of 10-15μm. The paint should be leveled after spraying at a temperature of 20-60℃ and a leveling time of 5-8min. 5) Spray clear paint at the double station, with a viscosity of 16 to 20 seconds, apply -4 cups, and a film thickness of 15 to 20 μm; 6) Bake and cure at a temperature of 140-150°C for 35-45 minutes to allow the paint to fully bond and fix the color.

2. The method for producing a wheel coated with color-changing paint according to claim 1, characterized in that: In step 3), when the chameleon paint is subsequently sprayed, the primer is a black primer.

3. The method for producing a wheel coated with color-changing paint according to claim 1, characterized in that: In step 3), when the reversible color-changing paint is subsequently sprayed, the primer is a white primer.

4. The method for producing a wheel coated with color-changing paint according to claim 1, characterized in that: In step 4), after the primer is leveled, you can also spray the luminous paint.

5. The method for producing a wheel coated with color-changing paint according to claim 1, characterized in that: In step 4), when spraying the color-changing paint, adjust the color-changing paint with the matching thinner to a construction viscosity of 14 to 18 seconds, and apply 4 cups.

6. The method for producing a wheel coated with color-changing paint according to claim 1, characterized in that: In step 4), the spray gun moves at a speed of 30 to 60 cm / s, maintaining a constant speed.

7. The method for producing a wheel coated with color-changing paint according to claim 1, characterized in that: In step 4), when spraying the second coat of color-changing paint, it should be cross-coated with the first coat, that is, if the first coat is sprayed horizontally, the second coat should be sprayed vertically.