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Coatings 2017, 7(12), 213; https://doi.org/10.3390/coatings7120213

IPN Polysiloxane-Epoxy Resin for High Temperature Coatings: Structure Effects on Layer Performance after 450 °C Treatment

1
Department of Chemistry, Material and Chemical Engineering, G. “Natta”, Politecnico di Milano, P.za Leonardo da Vinci 32, 20133 Milano, Italy
2
Akzo Nobel Coatings, Via Silvio Pellico, 10, 22100 Como, Italy
Present address: Institute of Materials, École Polytechnique Fédérale de Lausanne, EPFL, Route Cantonale, 1015 Lausanne, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editors: Assunta Marrocchi and Maria Laura Santarelli
Received: 23 October 2017 / Revised: 21 November 2017 / Accepted: 22 November 2017 / Published: 28 November 2017
Full-Text   |   PDF [9202 KB, uploaded 28 November 2017]   |  

Abstract

Coatings for high temperatures (HT > 400 °C) are obtained from interpenetrating polymer network (IPN) binders formed by simultaneous polymerization of silicone and epoxide pre-polymers. A ceramic layer; mainly composed of silica and fillers; remains on the metal surface after a thermal treatment at 450 °C. The layer adhesion and the inorganic filler’s distribution have been investigated by, firstly, exchanging the organic substituents (methyl and phenyl) of the silicone chains and, secondly, by adding conductive graphene nanoplatelets with the aim to assure a uniform distribution of heat during the thermal treatment. The results are evidence that different substituent ratios affect the polymer initial layout. The adhesion tests of paint formulations are analysed and were related to instrumental analyses performed using glow discharge optical emission spectroscopy (GDOES); thermal analyses (TG/DTA and DSC); electron microscopy with energy dispersive X-ray analysis (SEM-EDX). A greater resistance to powdering using phenyl groups instead of methyl ones; and an improved distribution of fillers due to graphene nanoplatelet addition; is evidenced. View Full-Text
Keywords: high-temperature coatings; corrosion protection; powder coatings high-temperature coatings; corrosion protection; powder coatings
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Giaveri, S.; Gronchi, P.; Barzoni, A. IPN Polysiloxane-Epoxy Resin for High Temperature Coatings: Structure Effects on Layer Performance after 450 °C Treatment. Coatings 2017, 7, 213.

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