Why should there be particles in the coating of industrial aluminum profiles?

by:Zeyi     2021-12-19
Industrial aluminum profile manufacturers' powder coatings have outstanding particles in appearance. Particles can be said to be a fatal damage to the exterior paint decoration, and ultimately affect the level of paint products. The existence of particles in powder coatings is inseparable from the characteristics of powder coatings, production processes and coating conditions. The non-filterability of powder coatings determines the existence of particle doubts in powder coatings. The following describes in detail the existence of powder-coated particles and how to reduce the existence of particles. Mechanical impurity particles mainly come from the material itself and its production process, equipment wear and impurities brought by the powder coating production process. The main results are as follows: (1) Due to the abundant raw materials or various mechanical impurities entering the production process, the particle shape composed of mechanical impurities is sharp. The resin manufacturer is required to use qualified raw materials, adhere to a clean production environment, strictly control the production process, and adopt Corresponding filtering method. (2) Impurities in pigments and fillers. In terms of titanium dioxide, barium, calcium, etc., some inferior products contain varying degrees of coarse gravel and black groceries. Such pigments and fillers will inevitably form particles in the coating. For particles, thinner pigments and fillers without 325-mesh sieving residue are not easy to show particles. The thicker the pigment and filler, the simpler the particles. However, if the color and filler are too fine, it will increase its oil absorption, which will affect the smoothness of the powder coating. This requires the color and filler of the coating to have a reasonable particle size and strictly control the existence of coarse particles. (3) In the production process of powder coating, due to the wear of the grinding hall and the falling of parts, metal chips may be produced, and the particles formed by the powder coating will be pierced by hand. (4) Fabric fibers can also form particles. Some powder coating manufacturers use cloth to accept materials at the batching outlets or commodity packaging ports. When the fibers fall off and wear for a period of time, there will be a series of particles in the materials or commodities. Mechanical impurities particles can also be brought into the pre-mixing position, including dust and other impurities in the outer packaging, as well as packaging (paper, plastic fibers, packaging lines, etc.). ) Fall into the blender. Therefore, in order to reduce the presence of particles, it is necessary to check these sections at any time. The shape and quantity of the rubber particles are relatively round, mainly from the production process of resin and powder coatings during the extrusion process. (1) Rubber particles in resin. During the resin production process, the reactor may be partially overheated or the mixing conditions may be poor, causing the entire batch of materials to present colloidal particles with excessive molecular weight and high melting point. These colloidal particles may not melt when squeezed during the powder coating production process, and it is difficult to break into too fine particles in the subsequent damage process. If such colloidal particles are mixed into ordinary powder coatings, they may form particles in the coating after the coating is sprayed and cured. (2) The extrusion process in the powder coating production process is the main factor for the existence of particles. On the one hand, it may be the composition of the equipment itself; on the other hand, it may be the composition of process control, either the temperature is too high, or the extruded material is idle. The temperature of the extruder is usually set at around 110°C. Hybrid, polyester, epoxy and other thermosetting powder coatings usually do not undergo chemical reactions at this temperature, leading to material adhesion. However, there is always a certain gap between the screw of the extruder and the screw barrel. The larger the gap, a certain amount of material may be left. In addition, there may be a certain gap between the screw and the screw, and the screw has a certain dead angle, so there may be some residual material. Under the long-term action of 110°C, these materials will undergo a chemical reaction, and then they will be cemented and can no longer be melted. No matter what kind of extruder, it can not prevent the existence of gelatinization in the extrusion process, but the degree of gelatinization is much lower in the extruder with small space, suitable length-to-diameter ratio, and strong self-cleaning ability.
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