Preparation method of powdery coating having three-dimensional metal effect

Abstract

The invention discloses a preparation method of a powdery coating having a three-dimensional metal effect. The method comprises the following steps: mixing resin, a curing agent, a leveling agent anda degassing agent in a conical mixer or a horizontal mixer to obtain a wrapping material; feeding the wrapping material from the solid conveying section of a single-screw extruder, feeding a metal pigment into the melt mixing section of the screw extruder, and performing melt wrapping to obtain a wrapped metal material; discharging and tabletting the wrapped metal material, and carrying out ACM milling and sieving to obtain a wrapped metal material; mixing the wrapped metal material with body powder; and cooling the obtained product to obtain the powder having the three-dimensional metal effect. The powdery coating has the advantages of maintenance of the metal texture, difficulty in breaking and damaging by high-speed mixing during later processing, strong chemical resistance, strong weatherability, safety, environmental protection, and high compatibility between the wrapping material and a powder coating formula.

Description

technical field [0001] The invention relates to the technical field of powder coatings, in particular to a manufacturing method of three-dimensional metallic effect powder coatings. Background technique [0002] Powder coatings are currently one of the most environmentally friendly coating systems due to their complete absence of organic solvents and their low VOC (Volatile Organic Compound) emissions during curing. [0003] Compared with liquid paints, powder coatings have advantages in environmental protection, and powder coatings are also anti-corrosion, weather-resistant, and beautiful and decorative. In recent decades, powder coatings have developed rapidly as a new technology in the coatings industry. As the country's requirements for environmental protection are getting higher and higher, changing paint to powder is an inevitable trend. [0004] At present, the manufacturing processes of metal powder coatings include the following: [0005] 1) Extrusion method: bef...

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Problems solved by technology

[0010] (1) With the existing manufacturing process and metallic pigments, the metallic effect powder coating produced has no three-dimensional effect, the arrangement of pigments and metallic texture are not strong, and the metallic effect of paint is quite different from that of paint

[0011] (2) In the existing manufacturing process, the addition amount of metallic pigments is limited, too high content will cause poor leveling of the coating film surface and increase the defect rate in the construction process

[0012] (3) The existing manufacturing process and metallic pigments will be broken during the manufacturing process, which will lead to a decline in performance

[0013] (4) Existing manufacturing process and metal pigments, due to the poor safety of metal pigments, there is a danger of inflammability and explosion in the manufacturing process;

[0014] (5) The existing metallic pigment wrapping process utilizes a twin-screw extruder to melt, because the kneading effect of the twin-screw is too strong, it will damage the wrapping material and metallic pigment, and lose performance

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