Powder coating capable of forming high-toughness coating

Abstract

The invention belongs to the field of materials and discloses a powder coating capable of forming a high-toughness coating. The powder coating comprises polyester resin, a curing agent, a filler, a toughening agent and an auxiliary agent, wherein the toughening agent is at least one selected from epoxy resin modified polyamideimide, and nylon or thermoplastic elastomers. The powder coating provided by the method can be used to prepare a coating by spraying and curing. Polyester resin and the curing agent are used as a film forming system, so that the reaction cross-linking density is proper, and the formed coating has large deformation resistance. The toughening agent is added to further improve toughness of the coating, so that the coating still has good toughness even if the coating reaches 130-180 microns, and requirements of parts on toughness of the coating in a stamping forming process can be met. Thickness of the high-toughness coating formed by the powder coating is 130 micronsor above, and the coating has good weather resistance.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a powder coating capable of forming a high-toughness coating. Background technique [0002] Powder coating has the advantages of environmental protection, high coating efficiency and excellent coating performance. As the use of powder coatings becomes more and more widespread, and the requirements for environmental protection become higher and higher, solid powder coatings gradually replace traditional solvent-based coatings. For example, in the field of electrical appliances, powder coatings are gradually replacing solvent-based coatings. However, when powder coatings are electrostatically sprayed on components with bending angles or similar corners, the powder coating rate is often not high, which is caused by the electrostatic shielding effect at the bending angles of the components. The powder rate is not high, resulting in the difficulty of complete coating during the curing proce...

AI Technical Summary

Problems solved by technology

However, when powder coatings are electrostatically sprayed on components with bending angles or similar corners, the powder coating rate is often not high, which is caused by the electrostatic shielding effect at the bending angles of the components.

The powder coating rate is not high, which makes it difficult to completely coat during the curing process, and the thickness is uneven

In this regard, there are mainly two ways to improve the existing technology: (1) adding a charging aid to increase the powder coating rate. The main components of the charging aid are surfactants, nitrogen-containing compounds, fatty acids, etc., which can reduce the static electricity of the powder coating. (2) After the powder coating is sprayed and solidified, it is then stamped and formed. However, this approach requires very high toughness of the cured coating. The coating formed after the powder coating in the prior art is cured Resilience is often insufficient

[0003] The cured powder coating in the prior art has excellent flexibility when the thickness of the coating is 80-120 μm, but the weather resistance is poor. If the coating thickness is increased to more than 130 μm, the toughness of the coating is very poor, and the parts cannot be stamped.

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