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Development of an ecological varnish from the resin of pine

Published online by Cambridge University Press:  25 October 2018

Nelly Flores-Ramírez
Affiliation:
Department of Wood Engineering and Technology, Universidad Michoacana de San Nicolás de Hidalgo (UMSNH), Morelia 58030, México
Erandini Guzmán-Mejía
Affiliation:
Department of Wood Engineering and Technology, Universidad Michoacana de San Nicolás de Hidalgo (UMSNH), Morelia 58030, México
Salomón R. Vásquez-García*
Affiliation:
Department of Chemical Engineering, UMSNH, Morelia 58030, México
Lada Domratcheva-Lvova
Affiliation:
Department of Wood Engineering and Technology, Universidad Michoacana de San Nicolás de Hidalgo (UMSNH), Morelia 58030, México
Leandro Garcia-Gonzalez
Affiliation:
Research Center for Micro and Nanotechnology, Universidad Veracruzana, Boca del Rio, Veracruz, 94292, Mexico
Julián Hernández-Torres
Affiliation:
Research Center for Micro and Nanotechnology, Universidad Veracruzana, Boca del Rio, Veracruz, 94292, Mexico
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Abstract

Rosin resin is constituted by rosin acids, in particular, abietic acid, which is an inexpensive substance. This paper concerns the study of the molecular interactions between a bifunctional monomer of abietic acid with isocyanate to form polyurethane. Polyurethane is a varnish that can be applied to any timber surface protecting it from chemical and environmental factors. Furthermore, the polar groups (OH´s) of the diol have a direction along the molecular axis thus, increasing their intermolecular interactions with the isocyanate groups. The varnish named as (PAR), was synthesized in the laboratory and applied to a timber surface whereby its functionality was evaluated. Morphological and spectroscopic studies were carried out on the diol obtained and the polyurethane. Likewise, we behaved several of physical and chemical analyses of vanish. The comparative SEM showed a homogeneous phase on the PAR surface and FTIR between the diphenylmethane, 4-4, diisocyanate (MDI) and the varnish from hydroxylated rosin resin (HAA) showed that the reaction was carried out in its entirety, exhausting the limiting reagent (MDI). The obtained varnish which was labelled as PAR has very suitable characteristics for indoor use. It has a transparent and bright appearance, a solids percentage of 44-45%, a drying time for application between layers and layers of 15-20 minutes.

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Articles
Copyright
Copyright © Materials Research Society 2018 

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