A kind of spraying method of aluminum profile and aluminum profile

Abstract

The invention discloses an aluminum profile spraying method, which comprises: performing sandblasting, degreasing, and passivation treatment on the aluminum profile in sequence; A first coating with a thickness of 50 μm; then an automatic coating system is used to spray the entire surface of the aluminum profile to be sprayed once to form a second coating; finally, the second coating is cured; wherein, the first The thickness of the second coating is 50-110 μm; the thickness of the third coating changes step by step from the center of the aluminum profile to the periphery of the aluminum profile. The thickness of the third coating layer formed by the spraying process of the present invention gradually increases from the center to the periphery of the aluminum profile, so that the overall aluminum profile has a gradual appearance effect and greatly improves the decorative performance of the aluminum profile. At the same time, the amount of powder coating used is also reduced, which reduces the cost.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a method for spraying aluminum profiles and the aluminum profiles. Background technique [0002] The current thermosetting powder coatings mostly use electrostatic powder coating, and the thickness of the coating film can reach more than 50 μm after one spraying, and it is easy to operate and can be fully automated. The electrostatic powder coating method can be divided into high-voltage electrostatic powder coating method and friction electrostatic powder coating method. Among them, the friction electrostatic powder coating method is still immature and has strict requirements on the type of powder coating, and the spray gun needs to be replaced frequently, and the cost is high . The cost of high-voltage electrostatic powder spraying method is relatively low, and it is the most widely used spraying technology at present. [0003] The principle of high-voltage electrostatic pow...

AI Technical Summary

Problems solved by technology

The applicant obtained through the coating test: when using ordinary powder coating for coating, when the coating is larger than 100 μm, the coating has a certain hiding power, the aluminum profile cannot be seen, and the overall color is darker and darker; while when the coating When the thickness is less than 65μm, the white aluminum profile can be seen under visual conditions, the texture is poor, and the overall decorative effect is poor

Moreover, each building has its own characteristics, and there are many special-shaped materials, which is not conducive to the control of the ideal coating thickness.

[0005] On the other hand, the size of the aluminum profile is also an important factor affecting its color rendering effect, especially some aluminum profiles used in curtain walls and exterior windows have a large length (generally more than 5m), and it is difficult to control the color rendering effect of different positions (especially external curtain wall)

In addition, the decorative effect of aluminum profiles is also affected by the surface of the aluminum profile, pre-treatment, and spraying operations.

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