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.
Highlights
The protection against corrosion of a metal surface with an organic or inorganic coating is the main application for coatings [1] (the global anticorrosion coating market was estimated to be $24.84 billion in 2017 and is projected to reach $31.73 billion by 2022, at a CAGR (Compound Annual GrowthRate) of 5.0% from 2017 to 2022 [2])
No relevant relevant layering is observed in both coatings as the concentration of all elements from the film layering is observed in both coatings as the concentration of all elements from the film surface to the surface to the substrate both slightly change at the same ratio (C, Ca, S) or remain unchanged (K, Al, substrate both slightly change at the same ratio (C, Ca, S) or remain unchanged (K, Al, Si, Mn)
The data led us to suppose that the interpenetrating polymer network (IPN) binder that is formed by two silicon-epoxide coatings
Summary
The protection against corrosion of a metal surface with an organic or inorganic coating is the main application for coatings [1] (the global anticorrosion coating market was estimated to be $24.84 billion in 2017 and is projected to reach $31.73 billion by 2022, at a CAGR (Compound Annual GrowthRate) of 5.0% from 2017 to 2022 [2]). The protection against corrosion of a metal surface with an organic or inorganic coating is the main application for coatings [1] 400–600 ◦ C, at which point the organic binders degrade due to the chemical and thermal instability of the C–C bonds. Traditional organic coatings for metals, like those based on acrylic and/or epoxy polymers, are stable only up to 60–80 ◦ C; above 150 ◦ C, degradation takes place. The binders based on hybrid organic–inorganic-containing polysiloxane show superior thermal stability [3]. Organicand inorganic-based monomers, or pre-polymers, mixed together, can separately self-polymerize with different chemistries changing the material performances, an example is the thermal behaviour, from
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