Abstract
Abstract Based on historic documents, two lime-based paint formulations were produced in laboratory in order to evaluate their basic characteristics as restoration materials for historic buildings with lime-based components. The paints were made basically with hydrated lime, clay, water and linseed (Linum usitatissimum L.) oil, and one formulation had PVA (polyvinyl acetate)-based glue as fixative, and the other one, Couma guianensis' latex. Each paint component was characterized by XRD and FTIR, and color and specular gloss measurements were performed on both paints. A preliminary assessment of the paints was conducted using the Pipe Method, the salt crystallization test, visual analysis for dustiness, and analysis of microbiological growth. The results showed that the laboratory-produced paints are theoretically and technologically compatible with lime-based coatings, however, their superficial performance can be improved to achieve greater durability. This study also brings to light local materials from the Amazon region that have great potential to be used and recognized as raw materials for paints and which could also be investigated for other uses.
Highlights
The evolution of various fields of knowledge has led to the development of different production and application techniques and to changes in the components and characteristics of paints
The materials used for the production of the paints were: commercial hydrated lime (100g) in powder form, linseed (Linum usitatissimum L.) oil (10ml), polyvinyl acetate (PVA) glue (20ml), water (500ml), red clay (10g of pigment) collected from natural deposits located near the city of Belém: in Paracuri, Icoaraci district, state of Pará (PA), Belém County and Couma guianensis’ latex (20ml) collected from trees found on Ceasa Highway, 1368-1506 - Curió Utinga, city of Belém - PA in a property belonging to the Eastern Amazon unit of the Brazilian Agricultural Research Corporation (EMBRAPA)
Lime-based restoration paints: characterization and evaluation of formulations using a native species from the 19 Amazon flora and PVA-based glue as additives
Summary
The evolution of various fields of knowledge has led to the development of different production and application techniques and to changes in the components and characteristics of paints. Restoration work is further hampered by the inadequacy of most commercially available materials, since one of the major issues in the conservation of decaying historic buildings is the maintenance and restoration of mortars, plasters and lime-based coatings. If these structures are not preserved through the use of compatible materials, and if they are exposed to weathering, deterioration will occur more quickly. Modern paints have a totally different physical structure than traditional paints, resulting in materials that are incompatible and do not fulfill many theoretical and technological requirements of restoration
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