నైరూప్య

Preparation and characterization of heat and corrosion resistance paint based on epoxy-silicon system

Vikrant V.Shertukde, Sushil V.Patil

Industrial application such as Chimneys, Automobile silencers, Boilers, Exhausts where normal operating temperature exceeds above 300-400OC, at this high temperature general industrial paints does not stands satisfactory and needs a special development of paint which can sustain this high temperature successfully. In the market scenario presently silicone based heat resistant paints are available up to 600 - 700Oc, but their cost is too high. The silicone structure is stable to oxidation, although it is susceptible to some rearrangement at elevated temperatures. The epoxyresin offers the advantages of mechanical toughness and adhesion while the silicone component provides the coating with its hardness properties. Therefore it is propose to prepare the paint which can sustain this temperature successfully at lower cost. This study will present an overview of the development of the silicone-epoxy blending system which offer heat and corrosion resistance. Silicone resin is blended withepoxy and mf resin at various compositions having pigmentation like aluminium paste and Tio2. Paint is characterized for Heat resistances by heat stability, optical microscope and spectrophotometer, Corrosion resistance by salt spray and electrochemical impedance spectroscopy (EIS), Solvent resistance, Chemical resistances, and Mechanical properties. Heat and Corrosion resistance paint based on epoxy-silicone was prepared successfully. It can resist the heat up-to 500oC as per ASTM specification D2485 and salt spray test as per the ASTM specification B 117 for 240 hours. The development of this paints system couldreduce the cost involved in the heat and corrosion resistant applications.