Epoxy/polyester type transparent powder paint and preparation method thereof

Abstract

The invention discloses an epoxy / polyester type transparent powder coating and the preparation method thereof. The transparent powder coating consisting of resin and curing system, degasifying agent, flow promoter and transparent dye adopts solid epoxy resin and polyester resin as main basis material and simultaneously adopts auxiliary agents compatible with the basis material and also adopts the transparent dye with excellent transparency and compatibility. The transparent powder coating is made of the following raw materials with the following weight percentages: epoxy resin 35-50 percent, polyester resin 45-65 percent, hydrogenated castor oil 0-3 percent, flow promoter 0.5-3 percent, benzoin 0.1-0.5 percent, and transparent dye 0-3 percent. The raw materials are formulated into a predispersing mixture according to the weight percentages, and then a finished product is obtained through high speed mixing, melting and extruding, pelleting, crushing and screening, thereby replacing the prior solvent type clear varnish or transparent pigmented paint. The transparent powder coating can be widely applicable to surfaces of metals like iron, aluminum, stainless steel and etc. and provide better light shading and protective decoration for the metals.

Description

1. Technical field [0001] The invention belongs to the technical field of powder coatings. 2. Background technology [0002] At present, the transparent coatings on metal surfaces are mostly made of liquid solvent-based transparent varnishes or transparent paints, and less environmentally friendly solid powder coatings are prepared, and mainly based on acrylic resin systems. Because the cost of acrylic resin is too high, it is limited. popularized applications of such products. Although there are also low-cost transparent powder coatings on the market, but because conventional acrylic additives are usually used in such products, the compatibility of such additives with the base resin is poor, resulting in a white coating on the metal surface. Turbidity affects its transparency, and it fails to achieve the transparent effect of solvent-based varnish or paint coating. 3. Contents of the invention [0003] One of the purposes of the present invention is to provide a kind of...

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Problems solved by technology

[0003] One of the purposes of the present invention is to provide a kind of epoxy / polyester type transparent powder coating, to overcome the existing liquid solvent type transparent varnish or transparent color paint that metal surface is used for transparent coating, there is non-environmental protection Requirements, and the disadvantages of high preparation cost of acrylic resin system, which lead to its inability to be widely used