Synthesis, characterization and development of high performance siloxane-modified epoxy paints

• Published in: Progress in organic coatings Vol. 54; no. 3; pp. 248 - 255
• Main Authors: Ahmad, Sharif, Gupta, A.P., Sharmin, Eram, Alam, Manawwer, Pandey, S.K.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01-11-2005; Elsevier Sequoia
• Subjects: Anticorrosive; Applied sciences; Coatings. Paints, varnishes and inks; Corrosion; Corrosion mechanisms; Epoxy resin; Exact sciences and technology; Manufacturing; Metals. Metallurgy; Paint; Polyamide; Polydimethylsiloxane; Polymer industry, paints, wood; Epoxy resin; Polyamide; Anticorrosive; Paint; Polydimethylsiloxane; Ring opening polymerization; Coatings; Retention; Formulation; Optical properties; Pigments; Epoxy resin: Polydimethylsiloxane; Manufacturing; Nuclear magnetic resonance; Infrared spectrum; Siloxane polymer; Scanning electron microscopy; Chemical resistance; Color; Thermogravimetry; Experimental study; Corrosion resistance; Bisphenol A; Gloss; Epoxide; Fourier transform spectra; Performance
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2005.06.013

Diglycidyl ether of bisphenol A (DGEBA) epoxy was modified with hydroxyl-terminated poly dimethyl siloxane (HPDMS), through ring opening addition polymerization reaction. The structural elucidation of the siloxane-modified epoxy resin (ESR) was carried out by FT-IR,
1H-NMR and
13C-NMR spectroscopic techniques. The physico-chemical characterization of the synthesized resin (ESR) was done by standard methods. DGEBA and ESR, were subjected to paint formulation with the help of TiO
2, Fe
2O
3 and lemon chrome pigments. The formulated paint systems were cured at room temperature with polyamide (PA) used as curing agent. The DGEBA–PA and siloxane-modified epoxy–polyamide (ESR–PA) paints were applied on mild steel strips. The physico-mechanical and anticorrosive performance of the coated panels was evaluated by standard methods. Thermal analysis of DGEBA–PA, epoxy siloxane/PA systems was carried out by thermogravimetric analysis (TGA). The effect of siloxane incorporation and the role of PA as a curing agent on the coating properties of these paint systems was also investigated. The ESR–PA system was found to exhibit good thermal and corrosion resistance performance.