Daily chemical products and food processing
Within the scope of application of FDA regulations, waxes can be used in daily chemical products as well as in food processing.
The melt viscosity of the resin powder coating is to attract the powder coating to the object to be coated by electrostatic attraction, and then the powder coating on the surface of the workpiece is melted and leveled under the condition of heating and baking. Due to the surface tension between the molten powder coating particles, The coating film of resin with high melt viscosity is not easy to level; for powder coating of resin with lower melt viscosity, it is easy to level, so as to obtain a smooth and uniform coating film.
Therefore, from the consideration of the melt leveling property of the powder coating, the resin The lower the melt viscosity, the better. Generally, the melt viscosity of wax the resin is closely related to the molecular weight and structure of the resin, especially the molecular weight has a greater impact. If the molecular weight of the resin is small, the corresponding resin melt viscosity is also low, but the molecular weight of the resin is too small, the melting temperature of the resin and the glass The melting temperature will appear too low, which will reduce the storage stability of the powder coating and some properties of the coating film. Therefore, under the premise of meeting the performance of powder coatings and coating films, a low melt viscosity of the resin is better, because the molecular weight of the general thermosetting powder coating resin is small, and the baking viscosity under baking and curing conditions is low: while the thermoplastic powder The coating resin has a large molecular weight and a correspondingly high melt viscosity. Therefore, the thermosetting powder coated with Kobe thermoplastic powder coating has good film leveling. In addition, when the heating temperature is higher than the melting temperature of the resin, the melt viscosity of the resin decreases rapidly. , This is conducive to the coating of powder coatings at low temperatures, and is conducive to the leveling of the coating film.
The stability of the resin The powder wood paint sprayed in the powder coating should be recycled and reused. If the stability of the powder coating is not good, it will be in contact with the air and humidity for a long time during the recycling process or affected by the environmental temperature. At the same time, physical (such as moisture absorption agglomeration or dry powder fluidity modification) or chemical changes will change the quality of the powder coating, causing the recycled powder coating to be unusable, so that the powder coating that does not reach the spray can be recycled and reused The purpose is to lose the advantages of powder coatings. The stability of the resin is the key factor that determines the stability of the powder coating. If the stability of the resin is not good, it will have certain influences and problems on the storage stability and use stability of the powder coating. The stability must be good to ensure the stability of the powder coating.
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