Powder coating sprayed through friction gun

Abstract

The invention discloses a powder coating sprayed through a friction gun. The powder coating comprises the following substances in parts by weight: 30-60 parts of polyester resin, 4.5-30 parts of curing agent, 0.8-1.2 parts of flatting agent, 18-25 parts of pigment, 0-17 parts of inorganic filler, 0-5 parts of adjuvant and 0.1-0.4 part of friction agent. Due to the introduction of the friction agent, a great difference between dielectric constants of the powder coating and a material (polymer PTFE material) for preparing the pipe wall and a friction rod of the friction gun is generated in the frictional spraying process, so that the powder coating can be perfectly adsorbed on a workpiece after being electrified by virtue of friction with the material in the friction gun under the drive of dry airflow; in addition, the frictional electrification way is adopted, so that the Faraday effect generated by a corona field is avoided, and all corners of the workpiece can be completely coated by the powder coating. Meanwhile, compared with an electrostatic spraying way, the powder coating has the advantages that the powdering rate of the workpiece is higher, and a cured coating film is more excellent in flatting effect.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a powder coating used for friction gun spraying. Background technique [0002] At present, powder coating spraying processes commonly include electrostatic spraying and friction gun spraying. Electrostatic spraying is widely used in China because of its low requirements for powder coatings. However, due to the generation of corona field and Faraday effect in electrostatic spraying, dead angles will appear in complex workpieces, and some corners are difficult to powder. Although the electrostatic gun has been improved many times, the Faraday effect can only be reduced, but it cannot be avoided. [0003] The friction gun spraying can well solve the problem of powder coating on the dead corners of complex workpieces. The friction gun spraying process has the following advantages: 1. The first powder coating rate is high, which improves efficiency and reduces recycled powder. 2. Overcoming ...

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Problems solved by technology

The material of the friction rod and the pipe wall in the friction gun is a special polymer material PTFE, its dielectric constant is 2.1, and any substance with a higher dielectric constant than its dielectric constant can get a positive charge after friction, but in The dielectric constant of the polyester resin in the powder coating is only about 3.0, and the dielectric constant of other auxiliary materials is even smaller, so the difference between the dielectric constant of the ordinary powder coating and the dielectric constant of the material used in the friction gun is too small, so there is no obvious difference. Triboelectricity

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