Bis-Phenol A epoxy resin-based coatings are known for excellent corrosion and chemical resistance. Limitations of this class of coatings are poor flexibility, thermal stability and weather resistance. The use of traditional siloxane resins to improve the thermal and weathering resistance of bis-Phenol A Epoxy coatings is well known in the industry. Organofunctional silicone polymers have limited utility in providing improved flexibility, but create recoatability issues. A new class of organo-functional siloxane resins developed by Dow Corning Corporation as epoxy resin crosslinkers provides flexibility with excellent recoat performance. This paper details work, which compares modification of a bis-phenol A epoxy paint with a variety of silicon-based technologies which includes: Aminopropyltrimethoxy silane, Aminopropylmethyldimethoxy, a Methoxy terminated siloxane resin, Silanol terminated siloxane resin and a novel Amine terminated siloxane resin. Evaluations include hardness, flexibility, gloss, solvent and chemical resistance, recoatability and QUV exposure.
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