Production process of metal powder coating

There are two main adding ways: dry mixing and melt extrusion .Both in the actual production process has been constantly improved and perfected.

The beginning of the metal powder coating basic melt extrusion method is used for production, with the traditional production process similar to powder coating, powder coating raw materials in a variety of added metals in the pigments, and high-speed pre-dispersion, melt extrusion, compression crushing, milling and screening, the system was finished. The method is simple process, metal powder pigment and binder to achieve sufficient mixing and bonding, but because of the presence of high-temperature process (130 ) extrusion, high shear grinding, resulting in the partial oxidation of the metal pigment surface, deformation or particleboard was crushed, resulting in appearance of the coating metal or no metal gray color effect.

In order to improve the appearance of the coating effect, metal powder supplierimproves the pigment production process, production process using an inert gas, the metal pigment particles coated surface protection treatment, significantly improved high-temperature corrosion-resistant metal paint capacity; powder manufacturing operators in the ground into powder and then add a small amount of metal in the paint, then a simple dry mixing process to achieve the purpose of improving product appearance. Although all efforts have been taken, but in the end, only suitable for the production of a small amount of metal powder coating products, such as flash powder coating (shimmering silver effect), hammer powder coating.

Initial dry mixing the metal pigment production process is to add pre-processed powder based compound, mixed with high-speed mixing dispersed facilities into finished products, the advantages of the method can be well dispersed metallic paint without damaging paint particle shape, paint chip floating and directional capabilities into full play, highlighting the effect of metal coating. The obvious lack of pigment particles and binder particles of both physical properties (such as density, shape) vary greatly, and there is no bond between the two adsorption in fluid, spray charged, electrostatic adsorption produced during the separation, resulting in coating different appearance and color film, recycled powder pigment content increased significantly because of the metal recycling is difficult to use, there are generally accumulated powder gun tip, put the shock people, guns and other burning issues.

The problem for the dry-mix equipment and dry-mix process of improvement and perfection of the base material for tablets and powder pigment particle separation issues, technical staff has developed a hybrid heating (hot mix technology, also known as bonding technology) production process, is to metal powder pigments and binders added mixing tank (reactor), the jacket to pass into the hot water or hot oil on the pot (kettle) body heat, while mixed dispersion while heating the material, while using inert gas protection measures, In a certain temperature (50 ~ 60 ) powder base material particles and the metal surface gradually soften and produce pigment film adhesion, adhesion after a certain time, the metal powder material cooled to room temperature, then powder processing, screening is finished. Material systems are different due to different manufacturers using hot mix hot mix process and equipment have different, but the heat obtained by mixing the metal powder coating film appearance of its products has improved significantly.

Currently hot mix process is gradually reaching maturity and can produce a large number of metal powder coatings. The decorative effect of coating is colorful. The coating has a wide range of applications and increasing sales on the market.