Powder coatings modified with silicone-containing polymer particles of hybrid structure

Janusz Kozakiewicz 1Anita Koncka-Foland 1Helena Kuczyńska 2

1. Industrial Chemistry Research Institute (ICRI), Rydygiera 8, Warszawa 01-793, Poland
2. Institute for Plastics Processing, Metalchem, Department of Paints and Plastics, ul. Gorzowska 50 A, Gliwice 44-100, Poland

Abstract

Powder coatings are among the most quickly developing coating materials due to the fact that they are 100% solids (contain only solid resins, fillers and other solid additives) and therefore are environmentally friendly. They are widely used for coating of metals, in particular in manufacturing of appliances or machinery equipment, and recently also in the automotive industry. One of the major problems to be solved in the field of powder coatings is development of tough materials which in the same time would have high degree of flexibility and therefore also high impact resistance, and would retain certain other features like good adhesion to metal substrates, high surface hardness and abrasion resistance and high water resistance. One of possible approaches to reach this goal is modification of powder coatings with solid nano-particles of core-shell structure where the core is silicone elastomer of low Tg (below -50oC) and the shell is hard thermoplastic polymer of high Tg (over 100oC). In this paper the results of modification of powder coatings based on epoxy resin-carboxylic polyester resin system with hybrid particles added in the form of a powder obtained from silicone-acrylic dispersions by drying will be presented. Those results fully confirmed that introduction of small amount of hybrid particles to the powder coating masterbatch led to great increase of impact resistance, cupping resistance, abrasion resistance and elasticity of the coating while other substantial coating properties (hardness, adhesion, water resistance, gloss) remained at the same level. Examination of coating surface by SEM revealed significant differences between unmodified and modified coatings which could be interpreted by enrichment of the latter with silicone, the phenomenon reported earlier for other silicone-modified coatings.

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Presentation: Oral at E-MRS Fall Meeting 2006, Symposium D, by Janusz Kozakiewicz
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-12 13:52
Revised:   2009-06-07 00:44
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