Revestimentos de alta camada obtidos com a modificação de resinas epóxi novolaca pela reação com organo-siloxano e catálise ácida

• Published in: Química Nova Vol. 40; no. 2; pp. 146 - 153
• Main Authors: Roberta Jachura Rocha, José Atílio Fritz Fidel Rocco, Maria Auxiliadora Silva de Oliveira, Koshun Iha
• Format: Journal Article
• Language: English
• Published: Sociedade Brasileira de Química
• Subjects: coatings; Corrosion; interpenetrating polymer network-IPN; novolac epoxy resin; polyether siloxane
• ISSN: 1678-7064
• DOI: 10.21577/0100-4042.20160177

Epoxy resins are an important class of thermostable polymers, widely used in structural applications or as adhesives. However, the low fracture resistance is their main weakness in many applications. Due to this fact, this study aims to modify a polymer matrix based on a novolac epoxy resin with an organo siloxane (AMS). The final properties of cured epoxys resins are affected by the curing process and the coatings modified in this study with AMS and cured with acid catalyst presented greater resistance to thermal decomposition compared to that cured with Aradur, demonstrating a higher content of crosslinking in the siloxane polyether and the novolak epoxy resin chains. This epoxy matrix modified was used to prepare coatings whose films applied to 1020 steel surfaces presented a resistance of 1010 Ohm-cm-2. This resistance value is one order of magnitude greater than that of epoxy resins films modified by siloxanes in published studies, which demonstrates a potential economy in terms of maintenance costs of metal structures and machines used in power plants (UTE). To obtain the developed inks in pilot plant scale, it was used an aromatic polyamine as curing agent, characterizing the product obtained as an epoxy bi-component paint for commercial use.