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Article

Multi-Analytical Assessment of Bodied Drying Oil Varnishes and Their Use as Binders in Armour Paints

1
Sciences and Technologies for the Conservation of Cultural Heritage, Department of Environmental Sciences, Informatics and Statistics, Ca’ Foscari University of Venice, Via Torino 155/b, 30173 Venice, Italy
2
Department of Conservation, University of Gothenburg, 40530 Gothenburg, Sweden
3
Courtauld Institute of Art, Somerset House, London WC2R ORN, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Nicola Masini
Received: 20 August 2021 / Revised: 23 September 2021 / Accepted: 12 October 2021 / Published: 14 October 2021
(This article belongs to the Special Issue Organic Materials in Heritage Science)
The characteristics of commercially available refined and bodied linseed and tung oils, used as binders in the production of armour paints after historic recipes, are explored. Employed as anticorrosive paints mainly from the 1920s to 1960s, armour paints are greener alternatives that can be used for protection in industrial heritage conservation. Using a multi-analytical approach, chemical and physical properties of the fresh oils and solid films before and after accelerated ageing (ISO 16474-2:2013) were investigated to better understand which features are beneficial for the technical function of armour paints. Tests included measurements of density, the refractive index, insoluble impurities, alkaline impurities, the water content, the iodine value, the saponification value, the free fatty acid concentration, the acid value, the peroxide value and colour (Lovibond) and cold tests. The characterisation of the fresh oils using molecular analysis with FTIR and GC-MS revealed the complexity of the commercial formulations, for which additions of semi- and non-drying oils were detected. The results show that organic paint binders follow complex chemical reactions (such as oxidation and decrease of unsaturation being variable or swelling following water-immersion tests), with implications for their suitability for use in protection. View Full-Text
Keywords: armour paints; bodied drying oils; anticorrosive coating; ferrous heritage; stand oil; tung oil; air-blown varnish; modern linseed oil; drying oil oxidation; ageing; imbibition armour paints; bodied drying oils; anticorrosive coating; ferrous heritage; stand oil; tung oil; air-blown varnish; modern linseed oil; drying oil oxidation; ageing; imbibition
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MDPI and ACS Style

Izzo, F.C.; Källbom, A.; Nevin, A. Multi-Analytical Assessment of Bodied Drying Oil Varnishes and Their Use as Binders in Armour Paints. Heritage 2021, 4, 3402-3420. https://0-doi-org.brum.beds.ac.uk/10.3390/heritage4040189

AMA Style

Izzo FC, Källbom A, Nevin A. Multi-Analytical Assessment of Bodied Drying Oil Varnishes and Their Use as Binders in Armour Paints. Heritage. 2021; 4(4):3402-3420. https://0-doi-org.brum.beds.ac.uk/10.3390/heritage4040189

Chicago/Turabian Style

Izzo, Francesca C., Arja Källbom, and Austin Nevin. 2021. "Multi-Analytical Assessment of Bodied Drying Oil Varnishes and Their Use as Binders in Armour Paints" Heritage 4, no. 4: 3402-3420. https://0-doi-org.brum.beds.ac.uk/10.3390/heritage4040189

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