Valorization of Kraft Lignin as Thickener in Castor Oil for Lubricant Applications

It is known that large amounts of residual lignin are generated in the pulp and paper industry. A new alternative for Kraft lignin valorization, which consists of first a chemical modification using a diisocyanate and then the efficient dispersion in castor oil to achieve stable gel-like systems, is...

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Autores: Borrero López, Antonio María, Santiago Medina, F. J., Valencia Barragán, Concepción, Eugenio, María Eugenia, Martín Sampedro, Raquel, Franco Gómez, José María
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Universidad de Huelva (UHU)
Repositorio:Arias Montano. Repositorio Institucional de la Universidad de Huelva
Idioma:inglés
OAI Identifier:oai:ariasmontano.uhu.es:10272/24647
Acceso en línea:https://hdl.handle.net/10272/24647
Access Level:acceso abierto
Palabra clave:Kraft lignin
Diisocyanate
Gel-like dispersion
Rheology
Thermal properties
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spelling Valorization of Kraft Lignin as Thickener in Castor Oil for Lubricant ApplicationsBorrero López, Antonio MaríaSantiago Medina, F. J.Valencia Barragán, ConcepciónEugenio, María EugeniaMartín Sampedro, RaquelFranco Gómez, José MaríaKraft ligninDiisocyanateGel-like dispersionRheologyThermal propertiesIt is known that large amounts of residual lignin are generated in the pulp and paper industry. A new alternative for Kraft lignin valorization, which consists of first a chemical modification using a diisocyanate and then the efficient dispersion in castor oil to achieve stable gel-like systems, is proposed in this work. Rheological properties and microstructure of these materials were determined by means of small amplitude oscillatory shear tests and viscous flow measurements and atomic force microscopy observations, respectively. Moreover, both standardized penetration tests and tribological assays, usually performed in the lubricant industry, were carried out to evaluate the performance characteristics as lubricating greases. Linear viscoelasticity functions are affected by the lignin/diisocyanate ratio and thickener concentration. The thermorheological response evidenced a softening temperature of around 105 °C. The microstructure of these gel-like dispersions is composed of interconnected thin fibers, homogeneously distributed in castor oil. Moreover, the NCO-functionalized lignin gel-like dispersions studied show lower friction coefficients than traditional lubricating greases.Tech Science Press20182018-01-0120182018-01-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/10272/24647reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelvainstname:Universidad de Huelva (UHU)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:ariasmontano.uhu.es:10272/246472026-06-02T14:58:11Z
dc.title.none.fl_str_mv Valorization of Kraft Lignin as Thickener in Castor Oil for Lubricant Applications
title Valorization of Kraft Lignin as Thickener in Castor Oil for Lubricant Applications
spellingShingle Valorization of Kraft Lignin as Thickener in Castor Oil for Lubricant Applications
Borrero López, Antonio María
Kraft lignin
Diisocyanate
Gel-like dispersion
Rheology
Thermal properties
title_short Valorization of Kraft Lignin as Thickener in Castor Oil for Lubricant Applications
title_full Valorization of Kraft Lignin as Thickener in Castor Oil for Lubricant Applications
title_fullStr Valorization of Kraft Lignin as Thickener in Castor Oil for Lubricant Applications
title_full_unstemmed Valorization of Kraft Lignin as Thickener in Castor Oil for Lubricant Applications
title_sort Valorization of Kraft Lignin as Thickener in Castor Oil for Lubricant Applications
dc.creator.none.fl_str_mv Borrero López, Antonio María
Santiago Medina, F. J.
Valencia Barragán, Concepción
Eugenio, María Eugenia
Martín Sampedro, Raquel
Franco Gómez, José María
author Borrero López, Antonio María
author_facet Borrero López, Antonio María
Santiago Medina, F. J.
Valencia Barragán, Concepción
Eugenio, María Eugenia
Martín Sampedro, Raquel
Franco Gómez, José María
author_role author
author2 Santiago Medina, F. J.
Valencia Barragán, Concepción
Eugenio, María Eugenia
Martín Sampedro, Raquel
Franco Gómez, José María
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv
dc.subject.none.fl_str_mv Kraft lignin
Diisocyanate
Gel-like dispersion
Rheology
Thermal properties
topic Kraft lignin
Diisocyanate
Gel-like dispersion
Rheology
Thermal properties
description It is known that large amounts of residual lignin are generated in the pulp and paper industry. A new alternative for Kraft lignin valorization, which consists of first a chemical modification using a diisocyanate and then the efficient dispersion in castor oil to achieve stable gel-like systems, is proposed in this work. Rheological properties and microstructure of these materials were determined by means of small amplitude oscillatory shear tests and viscous flow measurements and atomic force microscopy observations, respectively. Moreover, both standardized penetration tests and tribological assays, usually performed in the lubricant industry, were carried out to evaluate the performance characteristics as lubricating greases. Linear viscoelasticity functions are affected by the lignin/diisocyanate ratio and thickener concentration. The thermorheological response evidenced a softening temperature of around 105 °C. The microstructure of these gel-like dispersions is composed of interconnected thin fibers, homogeneously distributed in castor oil. Moreover, the NCO-functionalized lignin gel-like dispersions studied show lower friction coefficients than traditional lubricating greases.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018-01-01
2018
2018-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/10272/24647
url https://hdl.handle.net/10272/24647
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Tech Science Press
publisher.none.fl_str_mv Tech Science Press
dc.source.none.fl_str_mv reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelva
instname:Universidad de Huelva (UHU)
instname_str Universidad de Huelva (UHU)
reponame_str Arias Montano. Repositorio Institucional de la Universidad de Huelva
collection Arias Montano. Repositorio Institucional de la Universidad de Huelva
repository.name.fl_str_mv
repository.mail.fl_str_mv
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