Chalk resistant epoxy resins

• Published in: Progress in organic coatings Vol. 51; no. 3; pp. 172 - 180
• Main Authors: Malshe, V.C., Waghoo, Gulzar
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.12.2004; Elsevier Sequoia
• Subjects: Accelerated weathering; Applied sciences; Chalk resistance; Coatings. Paints, varnishes and inks; Dibasic acids; Environmental weathering; Epoxy resins; Exact sciences and technology; Film formation and curing, properties, testing; Polymer industry, paints, wood; Chalk resistance; Dibasic acids; Accelerated weathering; Epoxy resins; Environmental weathering; Modification; Stabilizator; Weight loss; Epoxy resin; Crosslinking; Paint; Experimental study; Yellowing; Degradation; Bisphenol A; Gloss; Additive; Extender; Optical properties; Pigments; Weathering; Chalk
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2004.07.018

The diglycidyl ethers of bisphenol A (DGEBPA), bisphenol F(DGEBPF) and bis 2,6-xylenol F(DGEBXF) were partially modified with various linear and aromatic dibasic acids. The paints prepared using these resins and cured with amine terminated dimer fatty acid based polyamide (FPA) were evaluated for their weathering characteristics by subjecting them to accelerated and environmental weathering. The chalk resistance and the gloss increased with the increase in the carbon length of the linear acids. The paint prepared with DGEBPA modified with sebacic acid and cured with FPA gave the best weathering characteristics with remarkable improvement in chalk resistance, optimum yellowing and good gloss retention. The aromatic modifications on the contrary enhanced the degradation of epoxy resins as evidenced by their faster chalking on exposure.