Electrophoresis of Aluminium Profiles

We talked about How to Electroplate on Aluminium Profiles previously, and drawn a conclusion of the general technological process, today, We will continue to discuss the electrophoresis of aluminium profiles in the following aspects:

1. The principle of electrophoresis technology

The electrophoresis is basically the same as the traditional light and transparent electrophoresis. The anode electrophoresis is carried out under the action of direct current. With the action of the electric field, the coated particles with charge are moved to the coated workpiece, which precipitates the electrophoresis coating deposited on the surface of the aluminium profile, forming a layer of film. The difference lies in the different types of coatings and the slightly different devices.

The electrophoretic coating includes acrylic resin, melamine resin, pigments, solvents, neutralizing agents, additives and other ingredients. Through the application of thermal fixing in the viaduct layer in the particle, the shape of the micro-concave coating during the process of baking was basically unchanged in the baking process, and the appearance of the film was formed uniformly. The degree of extinction can be adjusted by the ratio of high gloss paint and low gloss paint.

For profile color, due to the transparency of coating, the color of the product depends on the electrolytic coloring. The color of the profile can also be added to color, white, ivory, green, red, ash, etc., by selecting the color aluminum profile required by adding color pulp. The surface quality is better than spray.

2. Excellent performance of products

• high transparency and full measure, with special gloss and transparency, the coating has a high stereo effect, and the color of the substrate is obvious.
• the high hardness, when the temperature of 180 ℃ baking 30 min, hardness can be up to 4 to 5 h.
• good level of flow, strong paint film, and smooth film.
• with strong binding force and penetration, the coating is all-pervasive, and the wet film and dry film have a strong binding force.
• the performance is good, resistance to discoloration and corrosion when the baking temperature of 180 ℃ ~ 200 ℃ workpiece does not change color, lasting bright color products, corrosion effect is perfect.
• the average of the electrophoresis is good, the paint film is evenly flat, and can reach 10-16 um in 90-200v, high efficiency, and low power consumption.
• good impact resistance and artificial sweat resistance.
• it can be used for the surface protection of aluminum, metal electroplating, precious metal accessories, lamps and high-end furniture.
• it can be electrophoresis with various color slurry: titanium gold, general grey, real black and other colors. due to the superior screening rate of the matte electrophoresis coating, the extrusion mold pattern on the surface of the aluminum material has a certain degree of masking effect.And for the color difference of the dying process, it has a certain degree of compensation effect.

3. The principle and application of paint extinction

With electrophoresis coating technology development, in the coating industry in China, also become the world’s top coating production, forming a related industry group, and actively promote the technological revolution and development of traditional painting domain. During this period, the bright and bright gloss paints are popular with consumers with their bright colors and bright colors, and in a long time, the coating market. However, as people’s living standard has been improved, on the one hand, consumers have felt that the high gloss coating is more serious than the reflection, which is harmful to people’s eyes. On the other hand, the aesthetic concept of consumers is more and more casual, fashionable and personalized. Coupled with the booming demand of China’s electronics and appliance industries. These factors led to a sharp increase in demand for low-gloss coatings with a soft appearance. At the same time, it is necessary to consider how to produce paint with matte performance.

3.1 Influence factors of gloss and luster

3.1.1 Determination of gloss and luster

The light that is projected onto the surface of the object will reflect the light, and the surface of the object will be reflected in the light. Different surfaces have different gloss, measuring the size of the surface of the light reflected by the light, called glossiness. The gloss is expressed as a percentage, the higher glossiness of the surface, the greater the ability to reflect light and the higher the brightness. The size of the gloss is measured by the photoelectric gloss meter. According to the size of the gloss, the coating can be divided into light, sublight and weak light. Classification of gloss of coatings (with 60 reflections) :

• Weak light: gloss less than 10%;
• Sublight: gloss 10 ~ 60%;
• Light: glossiness > 60%.

3.2 Factors affecting luster

3.3 Roughness of the coating surface

The surface gloss of the object is closely related to the roughness of the surface. When the light is on the surface of the object, some of it will be absorbed by the object, some will reflect and scatter, and some will refraction. The smaller the surface roughness, the more light reflected, the higher the glossiness. Conversely, if the surface of the object is uneven, the scattered light increases, resulting in a decrease in the gloss. The surface roughness (h) of a polished object can be perceived by human vision, and the theoretical knowledge of micro surface can be calculated according to the formula: h=λ/cos a, in which λ is the wavelength of incident light; a is the incident Angle. Such as incident Angle when taking 60 °, it calculates the h = 1.1 μm, when the surface roughness of his greater than 1.1 μ m, it will show uneven, glossiness is reduced.