Powder coating

Abstract

The invention discloses a powder coating, comprising the following substances in parts by weight: 30-50 parts of end carboxyl saturated polyester resin, 4.5-20 parts of epoxy resin, 0.8-1 part of a flatting agent GLP588, 18-20 parts of a pigment, 0-17 parts of an inorganic filler, 1-2 parts of benzoin, 1-2 parts of a wetting agent, 0-1 part of a degassing agent and 0.3 part of an abrasive TBA. Through introduction of the abrasive, a large gap is formed between the powder coating and a fabrication material (high-polymer PTFE material) of a pipe wall of a friction gun and a friction rod in dielectric constant in the friction spraying process; the powder coating is prompted to be perfectly adsorbed on a work-piece after rubbing with the material in the friction gun to be electrified under the power of dry airflow; through a frictional electrification manner, the Faraday effect generated by a corona field is avoided; every corner of the work-piece can be completely covered by the powder coating; meanwhile, relatively to electrostatic spraying, the powdering rate of the work-piece is relatively high; the solidified film is relatively excellent in flatting.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a powder coating. 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 the Faraday effect, it is espec...

AI Technical Summary

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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