Weathering study of epoxy paints

The weathering characteristics of TiO 2-based paints of diglycidyl ethers of bisphenol A (DGEBPA), bisphenol F (DGEBPF), bis-2,6-xylenol F (DGEBXF), bis-2,6-xylenol S (DGEBXS) and bis-2,6-xylenol (DGEBX) with various curing agents have been studied by subjecting them to accelerated and environmental...

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Bibliographic Details
Published inProgress in organic coatings Vol. 51; no. 4; pp. 267 - 272
Main Authors Malshe, V.C., Waghoo, Gulzar
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 20.12.2004
Elsevier Sequoia
Subjects
Accelerated weathering
Applied sciences
Chalk resistance
Coatings. Paints, varnishes and inks
Curing agents
Environmental weathering
Epoxy resins
Exact sciences and technology
Film formation and curing, properties, testing
Paint
Polymer industry, paints, wood
Chalk resistance
Paint
Accelerated weathering
Epoxy resins
Environmental weathering
Curing agents
Xylenols
Weight loss
Curing agent
Epoxy resin
Experimental study
Yellowing
Degradation
Bisphenol A
Gloss
Optical properties
Weathering
Titanium oxide
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Summary:The weathering characteristics of TiO 2-based paints of diglycidyl ethers of bisphenol A (DGEBPA), bisphenol F (DGEBPF), bis-2,6-xylenol F (DGEBXF), bis-2,6-xylenol S (DGEBXS) and bis-2,6-xylenol (DGEBX) with various curing agents have been studied by subjecting them to accelerated and environmental weathering. Of all the epoxy resins, the paint using DGEBPA gave the best weathering characteristics with better chalk resistance, optimum yellowing and good gloss retention when cured with amine terminated dimer fatty acid-based polyamide. The methyl substitutions on aromatic ring and presence of methylene and sulfone groups between the phenolic moieties caused enhanced degradation of epoxy resins as evidenced by their faster chalking on exposure. When cured with an aminosilane compound all the epoxy paints showed excellent improvement in chalk resistance but were associated with poor initial gloss and more yellowing during exposure. The relationship between the two types of weathering was found to be approximately two and a half hours exposure in accelerated ageing being equal to 1 day in environmental weathering in Mumbai (India), thus leading to a nearly 10-fold acceleration of weathering.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2004.07.007