Why Are There Particles in Industrial Aluminum Profile Paint? -WJW Aluminum Supplier Aluminum

The appearance of industrial aluminum profile manufacturers' powder coatings appeared on the appearance. Granules can be said to be the fatal destruction of external coatings, which ultimately affects the level of paint products. The existence of particles in powder coatings is inseparable from the characteristics of powder coatings, production technology and coating conditions. The non -filtering of powder coatings determines the existence of particle doubts in powder coatings. The following introduces the factors of the existence of powder -covered particles and how to reduce the existence of particles.

Mechanical impurities particles mainly come from the material itself and their production processes, equipment wear and powder coating production process.

The main results are as follows: (1) Due to rich raw materials or various mechanical impurities entering the production process, the granular shapes composed of mechanical impurities are sharp, and resin production manufacturers are required to use qualified raw materials, adhere to the clean production environment, strictly control the production process, and adopt adoption Corresponding filtering method.

(2) impurities in pigments and fillers. In terms of titanium dioxide, cricket, calcium, etc., some inferior products contain varying degrees of rough gravel and black grocery. This pigment and filler will inevitably form particles in the coating. For granules, the thinner pigments and fillers without 325 mesh screening residues are not easy to show particles. The thicker the pigment and fillers, the simpler the particles. However, if the color and fillers are too thin, it will increase its oil absorption and then affect the level of the powder coating. This requires the color and filler of the coating to have reasonable particle size and strictly control the existence of coarse particles.

(3) During the production of powder coating, due to the wear of the grinding hall and the fall of parts, metal dandruff may be generated, and the particles formed by the powder coating will be pierced by hand.

(4) Fiber fiber can also form particles. Some powder coating manufacturers use cloth to receive materials on the ingredient export or product packaging port. When the fiber is out of the material for a period of time, there will be a series of granules in the materials or products. Mechanical impurities particles can also be brought into the pre -mixed position, including dust and other impurities in external packaging, as well as packaging (paper, plastic fiber, packaging line, etc.). ) Fall into the mixer. Therefore, in order to reduce the existence of particles, it is necessary to check these sections at any time.

The shape and quantity of glue grain particles are relatively round, mainly due to the production process of resin and powder coatings during the extrusion process.

(1) Glamination in resin. In the process of resin production, the reactor may be overheated or the mixed conditions may be poor, so that the entire batch of materials present the meta with a large molecular weight and high melting point. These colloidal particles may not melt when they squeeze during the production of powder coatings, and it is difficult to break into too thin particles during the subsequent injury. If this colloidal particles are mixed in ordinary powder coatings, they may form particles in the coatings after the coatings are sprayed and solidified.

(2) The squeezing process in the production process of powder coatings is the main factor of the existence of particles. On the one hand, it may be the composition of the device itself; on the other hand, it may be the composition of process control, or the temperature is too high or the material is squeezed out of idleness. The temperature of the extruder is usually set at about 110 C. Hybrid, polyester, and epoxy types such as thermosetry powder usually do not have a chemical reaction at this temperature, resulting in material bonding. However, there is always a certain gap between the screw and the screw cylinder. The larger the gap, the larger the gap may leave a certain amount of materials. In addition, there may be a certain gap between the screw and the screw, and the screw has a certain dead end, so there may be some material residues. Under the long -term action of 110 C, these materials will have a chemical reaction, and then glue knots will not melt. No matter what kind of extrusion machine, it cannot prevent the existence of pastement during the extrusion process, but the degree of vitality with small space, long diameter than suitable, and strong self -cleaning capacity is much lower.