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1 to 50 of 126 results
  • Design of a prototype to produce a new collagen material by dehydration

     Olle Otero, Luis; Sorolla, Silvia; Casas, Concepció; Bacardit Dalmases, Anna
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2014-01-07
    Journal article

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  • Evaluation of a new environment friendly tanning process

     Bacardit Dalmases, Anna; van der Burgh, Stefan; Armengol, Jordi; Olle Otero, Luis
    Journal of cleaner production
    Date of publication: 2014-02-06
    Journal article

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  • Low carbon products to design innovative leather processes. Part II: determination of the optimal physical modification of tara

     Olle Otero, Luis; Casas, Concepció; Diaz, Jorge; Sorolla, Sílvia; Bacardit Dalmases, Anna
    Journal of the American Leather Chemists Association
    Date of publication: 2014-01-01
    Journal article

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  • DEVELOMENT OF SUSTAINABLE TANNIN WITH LOW CARBON FOOTPRINT TO OBTAIN HIGH QUALITY LEATHER.

     Diaz Muñoz, Jorge Gerardo
    Defense's date: 2014-02-18
    Universitat Politècnica de Catalunya
    Theses

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    Hoy estamos viviendo un "boom ecolÛgico", esto significa desarrollar procesos con un menor impacto ambiental y tratar dehacerlos lo m· s ecolÛgico posible. Esa es la razÛn de llevar a cabo esta tesis, se trata de usar un extracto vegetal comoproducto sostenible para procesos de pre-curtido, curtido y re-curtido. Esta tesis considera el fruto del · rbol de Tara comomateria prima y fuente de taninos con baja huella de carbono, adem· s propone alternativas para evitar o disminuir el uso deextractos vegetales comerciales, productos sintÈticos y sales minerales que son preparados por procesos no sostenibles.Varios diseÒos experimentales han sido desarrollados para obtener un nuevo tanino de Tara modificado quÌmica yfÌsicamente, con el fin de obtener un porcentaje m· s alto de taninos y por lo tanto mejorar su capacidad de curticiÛn,adem· s se busca mejorar la penetraciÛn de la molÈcula de tanino dentro de la estructura de la piel. En las modificacionesquÌmicas, varias extracciones acuosas a diferentes temperaturas y combinadas con algunos productos quÌmicos, han sidodesarrolladas y optimizadas con el fin de reducir la astringencia y aumentar el contenido de tanino. El grado de hidrÛlisis seha controlado mediante la mediciÛn del contenido de · cido g· lico por HPLC (CromatografÌa en fase liquida de altorendimiento, por sus siglas en ingles). En la modificaciÛn fÌsica, la Tara se ha molturado y tamizado, en varios tamaÒos departÌcula, con el fin de obtener un tamaÒo molecular m· s pequeÒo.Ambas modificaciones quÌmicas y fÌsicas se han probado en la piel, en un proceso de precurtido wet-white, combin· ndoloscon la menor cantidad posible de extractos vegetales comerciales y sintanes. Las formulaciones se han optimizado pordiseÒo experimental. Con el objetivo de utilizar la nueva tara modificada tambiÈn como curtiente vegetal, se ha desarrolladoun diseÒo experimental a fin de obtener la combinaciÛn Ûptima entre Tara, Mimosa y Quebracho. El tanino de Tara se hautilizado como agente de re-curticiÛn de cueros curtidos al cromo (Wet-Blue) por bastante tiempo, en esta tesis se utiliza lanueva tara modificada tambiÈn como re-curtiente para tratar de mejorar la solidez a la luz del cuero. Todos los cuerosproducidos y baÒos finales de curtido han sido analizados con ensayos fÌsicos y quÌmicos respectivamente, para determinarsi cumplen con los par· metros establecidos por los est· ndares de la IULTCS (UniÛn Internacional de TecnÛlogos ySociedades de QuÌmicos del Cuero, por sus siglas en ingles).Complementando esta tesis, hay dos articulos publicados en el Journal of the American Leather Chemists Association(JALCA), con nombre:1. Low carbon products for the design of innovative leather processes. Part I: determination of the optimal chemicalmodification of tara.2. Low carbon products for the design of innovative leather processes. Part II: determination of the optimal physicalmodification of tara.Anna Bacartit1, ConcepciÛ Casas1, Jorge DÌaz1, Silvia Sorolla1, LluÌs OllÈ1.1 A3 Chair in Leather Innovation. Escuela de IngenierÌa de Igualada(EEI). Universitat PolitËcnica de Catalunya (UPC). PlaÁadel Rei, 15. 08700 ñ Igualada (Spain).

  • Developing of a dehydration process for bovine leather to obtain a new collagenous material

     Olle Otero, Luis; Sorolla Casellas, Sílvia; Casas Solé, Concepció; Bacardit Dalmases, Anna
    Journal of cleaner production
    Date of publication: 2013-07-15
    Journal article

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    The aim of the present work is to develop a dehydration process for bovine hide to obtain a new collagenous material for use in the leather industry. What is obtained through this new process is a dry and very porous collagenous substrate which allows the application of tanning and retanning chemicals by immersion in aqueous solutions. When compared to existing, traditional processes, there are economic and environmental advantages resulting from the use of this new material. More specifically, the new process results in reductions in water use (21.7%), chemical use (46.9%) and processing time (21%).

  • Low carbon products for the design of innovative leather processes. Part I: Determination of the optimal chemical modification of tara

     Bacardit Dalmases, Anna; Casas Solé, Concepció; Díaz Muñoz, Jorge; Cuadros Domènech, Rosa Maria; Olle Otero, Luis
    Journal of the American Leather Chemists Association
    Date of publication: 2013-09-23
    Journal article

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    Este estudio considera el fruto del arbusto tara como fuente sostenible de agentes curtientes y propone alternativas a las sales minerales y extractos vegetales para uso comercial. Específicamente, en la parte I del estudio diversos procesos de modificación física y química se han desarrollado con el fin de obtener una tara modificada con un mayor porcentaje de taninos que permita mejorar su capacidad de curtido. Varios procesos de extracción acuosa a diferentes temperaturas se han desarrollado y optimizado con el fin de disminuir la astringencia y facilitar la penetración de las moléculas de tanino a través de la estructura de cuero.

  • Tara (Caesalpinia spinosa): the sustainable source of tannins for innovative tanning processes

     Castell, Joan Carles; Sorolla, Silvia; Jorba, Montse; Aribau, Joaquim; Bacardit Dalmases, Anna; Olle Otero, Luis
    Journal of the American Leather Chemists Association
    Date of publication: 2013-06-03
    Journal article

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    This study considers the fruit of the tara tree as a sustainable source for tanning agents and proposes alternatives to the commercial mineral salts and vegetable extracts to comply with environment and social concerns. Tara tannins have been used in retanning formulas in leather processing and its properties are well known. This work aims to optimize formulations using tara as a pre-tanning agent. Combinations with a naphthalene sulphonic syntan are used to obtain an innovative wet-white recipe in which shrinkage temperature, tensile strength, tensile elongation, tear load and lightfastness properties are considered as statistical variables

  • Sustainable solvent-free finishing of patent leather using carbonyl-functional resins

     Olle Otero, Luis; Bou Serra, Jorge; Shendrik, Alexander; Bacardit Dalmases, Anna
    Journal of cleaner production
    Date of publication: 2013-07-29
    Journal article

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  • Development of nanocomposites with antibacterial effect for leather and textile

     Bacardit Dalmases, Anna; Casas Solé, Concepció; Bou Serra, Jorge; Rocas, Josep; Olle Otero, Luis
    Congress of IULTCS
    Presentation's date: 2013-05-30
    Presentation of work at congresses

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  • Characterization of the volatile organic compounds by hs-spme-cg-ms in the leather sector

     Cuadros Domènech, Rosa Maria; Olle Otero, Luis; Bacardit Dalmases, Anna; Font Vallès, Joaquim
    Journal of the American Leather Chemists Association
    Date of publication: 2013-11
    Journal article

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    Determination of fungicides in residual tanning floats using solid phase micro extraction  Open access

     Font Vallès, Joaquim; Reyes Reyes, Maria; Cuadros, Sara; Bacardit Dalmases, Anna; Olle Otero, Luis; Marsal Monge, Agustín
    Journal of the American Leather Chemists Association
    Date of publication: 2013-02-04
    Journal article

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    Solid-phase microextraction (SPME) was optimized for extraction of the leather preservative agents 2-(thiocyanomethylthio)-benzothiazole (TCMTB), 4-chloro-3-methylphenol (PCMC), 2-phenylphenol (OPP), 2-Octyl-3(2H)-isothiazolone (OIT), 2-mercaptobenzothiazol (MBT) and 3-iodo-2-propynyl-butylcarbamate (IPBC) in spent tanning floats. Determination was carried out by high performance liquid chromatography (HPLC) with photo diode array detection (PDA). The following parameters were studied to achieve the maximum efficiency in extraction: fiber type, adsorption conditions (extraction time, ionic strength, temperature) and desorption parameters (time, temperature and composition of the desorption solvent). Results indicate that SPME using a 60um polydimethylsiloxane/divinylbenzene (PDMS/DVB) fiber is appropriate for the extraction of these types of compounds. Recoveries ranged from 82% to 116% with RSDs between +-8% and +-12% and limits of detection below 1 mg/L except for IPBC. The optimized procedure was successfully applied for the determination of leather preservatives in eleven residual tanning floats taken from different companies. This method enables us to determine quantitatively the fungicides contained in th residual floats. Consequently, it will constitute a very useful tool to improve the preservative uptake in leather manufacturing processes

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    Nuevas aplicaciones de la cromatografía iónica en el sector de curtidos  Open access

     Perez Quiñones, Carmen; Bacardit Dalmases, Anna; Olle Otero, Luis; Reyes Ferrera, Mª Reyes; Font Vallès, Joaquim
    Congreso Asociación Química Española de la Industria del Cuero
    Presentation's date: 2012-05-17
    Presentation of work at congresses

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    La industria de curtidos utiliza gran variedad de productos químicos en las diferentes etapas del proceso de curtición. Una parte de estos productos son absorbidos por las pieles, mientras que el resto pasan a las aguas residuales contribuyendo algunos de ellos al aumento de la salinidad. Muchos de estos productos químicos presentan un componente aniónico. En el contexto del control de calidad, los laboratorios del sector de curtidos tienen la necesidad de analizar especies aniónicas en diferentes muestras, tales como productos químicos, aguas residuales, baños de diferentes etapas y piel piquelada, curtida y acabada. En otros sectores, la tendencia actual en el análisis de aniones es el uso de técnicas sensibles y rápidas, como la cromatografía líquida de alta resolución. En este estudio se desarrollan métodos cromatográficos innovadores, con detección ultravioleta indirecta y directa, para la determinación simultánea de los principales aniones de interés en la industria de curtidos (cloruro, sulfato, nitrato, acetato, formiato, fosfato, nitrato, fluoruro y bromuro). Estos métodos se aplican a diferentes muestras. Se optimiza un método con cromatografía iónica y detección indirecta. La separación se realiza utilizando biftalato potásico como fase móvil. También se presenta un nuevo método cromatográfico simple, con detección ultravioleta directa y sulfato sódico como eluyente

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    Curtición vegetal con extracto de semilla de uva  Open access

     Ramon Arcal, Salvador; Bacardit Dalmases, Anna; Font Vallès, Joaquim; Olle Otero, Luis
    Congreso Asociación Química Española de la Industria del Cuero
    Presentation's date: 2012-05-17
    Presentation of work at congresses

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    El objetivo de este trabajo es estudiar la viabilidad de usar el extracto de semilla de uva procedente de subproductos de la industria vinícola, como fuente sostenible y renovable de taninos para curtir pieles vacunas al vegetal, frente a los extractos vegetales convencionales de quebracho, mimosa, castaño, gambier, o tara que provienen de arboles cultivados en zonas geográficas concretas. La substitución parcial en el proceso industrial de las tenerías de alguno de los extractos habituales por el de semilla de uva, contribuiría al esfuerzo por preservar la deforestación del planeta. Primero se comparan las características físicas de la piel vacuna curtida con un extracto único, para fabricar vaquetilla vegetal natural. Se evalúa el artículo obtenido y se controlan las resistencias a la tracción y al desgarro, alargamiento a la rotura, grueso, solidez a la luz, color y absorción de agua. También se realiza una cromatografía líquida de cada uno de los taninos usados. A continuación se realiza un “coupage” de extracto de semilla de uva con otros extractos comerciales para conseguir una vaquetilla con mejores prestaciones y se compara con productos comerciales presentes en el mercado de la marroquinería de alta calidad

  • Synthesis of highly carboxylate acrylic resins for leather impregnation

     Olle Otero, Luis; Solé, MM; Shendrik, Alexander; Labastida, L; Bacardit Dalmases, Anna
    Journal of the American Leather Chemists Association
    Date of publication: 2012-01-11
    Journal article

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    This work describes the synthesis of new leather finishing acrylic resins. Four resins ware synthesized varying the concentration of ethyl acrylate, and metracrylic acid. Sodium lauryl sulphate was used as emulsifying system. By means of an experimental design, an optimal resin for leather impregnation was defined. The results obtained indicated that the variation of the monomer concentration influences the resin properties, the hardness of the film, and the penetration into the leather. Most importantly, this new highly carboxylate acrylic resin enables leather impregnation without the use of surfactants or penetrating agents

  • Comparison of weathering variables on chrome-tanned and wet-white leather ageing

     Olle Otero, Luis; Jorba, Montse; Castell, Joan Carles; Font Vallès, Joaquim; Bacardit Dalmases, Anna
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2012-02-08
    Journal article

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    Leather is a natural material that can be used in different environments and often under aggressive environmental conditions that may cause premature ageing. The most important factors influencing the degradation of leather are temperature, relative humidity and UV radiation. Leathers with chrome tannage and wet-white leathers were exposed to weathering effects using a climatic chamber in order to identify the most important variables affecting this weathering process and to check for interactions. Both a multilevel centralized factorial experimental design and an analysis of variance (ANOVA) have been employed as statistical tools for estimating the effects of the parameters

  • Humic acid derivatives as tanning and retanning agents

     Bacardit Dalmases, Anna; Morera Prat, Josep Maria; Shendrik, Alexander; Jorge Sanchez, Juan; Olle Otero, Luis
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2012-04-02
    Journal article

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    This study examines the behaviour of three types of humic acids (natural humic acids, regenerated humic acids, and sulphited humic acids) with regard to their capacity to be used as tans and retans. The study makes use of conditions set out in a previous study (See Determination of penetration and fixation curves of leather using humic derivatives). Additionally, subsequent complementary tests were carried out using other retans that are commonly used in the tanning industry in order to compare and improve on the physical properties assessed here

  • Study of the effect of temperature, relative humidity and UV radiation on chrome-tanned leather ageing

     Bacardit Dalmases, Anna; Jorba, Montse; Font Vallès, Joaquim; Olle Otero, Luis
    Journal of the American Leather Chemists Association
    Date of publication: 2012-06-01
    Journal article

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    Since leather is strongly affected by three main environmental parameters: temperature, relative humidity and UV radiation, this piece of research focuses on the effect that these three factors have on chrome-tanned leather ageing. Chrome tanned leathers were exposed to weathering effects in a climatic chamber in order to identify the most important variables affecting this weathering process and also to check for any possible interactions. Both a multilevel centralized factorial experimental design and an analysis of variance (ANOVA) were used as statistical tools for estimating the effects of the parameters

  • Determination of penetration and fixation curves of leather using humic derivatives

     Bacardit Dalmases, Anna; Shendrik, Alexander; Morera Prat, Josep Maria; Bou Serra, Jorge; Olle Otero, Luis
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2012-06-18
    Journal article

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    This study examines the behavior of three different types of humic acids (natural humic acids, regenerated humic acids, and sulphited humic acids) with regard to their penetration and fixation to the leather. More specifically, through the tests carried out the curves of penetration and fixation were drawn, and from these the optimum pH intervals of penetration and fixation to the leather were determined. The data obtained is essential in view of the subsequent application of humic acids as tanning agents and/or retanning agents

  • Contribució a l'estudi de la degradació i envelliment de la pell

     Jorba Rafart, Montse
    Defense's date: 2012-02-10
    Department of Engineering Presentation, Universitat Politècnica de Catalunya
    Theses

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  • TARA (Caesalpinia spinosa): The sustainable source of tannins for innovative tanning processes  Open access

     Castell Escuer, Juan Carlos
    Defense's date: 2012-03-02
    Department of Engineering Design, Universitat Politècnica de Catalunya
    Theses

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    This thesis considers the fruit of the tara tree (Caesalpinia spinosa) as a sustainable source for tanning agents and proposes alternatives to the commercial mineral salts and vegetable extracts to comply with an increasing demand that concerns lower carbon footprint and health safety. Taxonomy of the tree is described and the substances contained in the fruit are chemically characterized in order to justify that tara farm forestry is economically viable and to secure a potential worth. The value chain is fully described from fruit collection in remote Andean regions to the export for the most important leather markets. Although tara tannins have been used in the leather industry and its properties being well known, the experimental part of the work aims to optimize innovative formulations using tara as wet-white pre-tanning agent. Combinations with a selected syntan used for wet white and final article recipes are proposed

    Esta tesis considera el fruto del árbol de tara (Caesalpinia spinosa) como fuente sostenible de taninos para la curtición del cuero y propone alternativas para las sales minerales y los extractos vegetales como respuesta a la creciente demanda para reducir el impacto medioambiental y la seguridad de los artículos de consumo. Se describe la taxonomía del árbol así como la caracterización de su fruto para justificar la silvicultura como práctica económicamente viable y asegurar su valor y la cadena desde la recolección de los frutos en las regiones andinas hasta la exportación a los mercados más importantes de la industria del cuero. Aunque los taninos de la tara ya se usan para la fabricación de cueros desde épocas remotas y sus propiedades están reconocidas, la sección experimental de este trabajo se orienta a optimizar fórmulas innovadoras utilizando la tara como agente de curtido wet-white. Se proponen fórmulas para artículos finales.

  • Internacionalización y gestión de los mercados del cuero

     Olle Otero, Luis; Bacardit Dalmases, Anna
    Date of publication: 2012-02-01
    Book

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    Use of water-based carbonyl-functional polymers on a cross-linker-free high performance leather finishing  Open access

     Olle Otero, Luis; Urteaga, Eva; Font Vallès, Joaquim; Labastida, Luis; Bacardit Dalmases, Anna
    Afinidad: revista de química teórica y aplicada
    Date of publication: 2012-01-01
    Journal article

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    The present paper aims to study a new high-performance coating formulation while avoiding the use of cross-linkers. By using acrylic polymers with carbonyl functional groups, the negative environmental effects of the finishing process can be minimized. These new polymers can give very good physical properties without losing the inherent properties of flexibility and elasticity needed in upholstery leather

  • Study of cross-linking reactions of polysilanes

     Shendrik, Alexander; Bacardit Dalmases, Anna; Olle Otero, Luis
    International Leather Engineering Congress
    Presentation's date: 2011-05-12
    Presentation of work at congresses

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    Nowadays, there are four types of commercially available cross-linkers for the leather industry: polyaziridines, polyisocyanates, polycarbodiimides and epoxy compounds. All these products present different chemical reactivity and have different reaction rates. This study explores the cross-linking reaction between an epoxy functional alkoxysilane and both acrylic binders and polyurethanes. Although this type of cross-linker is employed in sectors other than the leather industry, it can be used in finishing processes. A comparison of results indicates that such cross-linker presents a better cross-linking reaction rate than polyaziridine, polyisocyanate, polycarbodiimide and epoxy compounds.

  • Study of the weathering variables on chrome-tanned leather ageing

     Bacardit Dalmases, Anna; Jorba, Montse; Castell, Joan Carles; Font Vallès, Joaquim; Olle Otero, Luis
    IULTCS Congress
    Presentation's date: 2011-09-28
    Presentation of work at congresses

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    Since upholstery leather is considered a very high-tech product, a long service life is expected by the costumer. However, this type of leather can undergo extreme environmental conditions that may cause premature ageing. This work deals with the study of the effect of temperature, relative humidity, and UV radiation on leather ageing. Leathers with chrome tannage were exposed to weathering effects using a climatic chamber in order to identify the most important variables affecting this weathering process and to check for interactions. Both a multilevel centralized factorial experimental design and an analysis of variance (ANOVA) have been employed as statistical tools for estimating the effects of the parameters.

  • Biodegradation in compost of recycled low density polyethylene/polycaprolactone blends

     Bou Serra, Jorge; Marroyo Molina, Luis Miguel; Alla Bedahnane, Abdelilah; Olle Otero, Luis; Bacardit Dalmases, Anna; Santana Pérez, Orlando Onofre; Maspoch Ruldua, Maria Lluïsa
    European Polymer Congress
    Presentation's date: 2011-06-26
    Presentation of work at congresses

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  • Study of cross-linking reactions of epoxy compounds

     Bacardit Dalmases, Anna; Shendrik, Alexander; Combalia Cendra, Felip; Jorge Sanchez, Juan; Olle Otero, Luis
    International Leather Engineering Congress
    Presentation's date: 2011-05-12
    Presentation of work at congresses

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    Tara (Caesalpinia spinosa): The sustainable source of tannins for innovative tanning processes  Open access

     Castell, Joan Carles; Sorolla, Silvia; Jorba, Montse; Aribau, Joaquim; Bacardit Dalmases, Anna; Olle Otero, Luis
    IULTCS Congress
    Presentation's date: 2011-09-28
    Presentation of work at congresses

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    This study considers the fruit of the tara tree as a sustainable source for tanning agents and proposes alternatives to the commercial mineral salts and vegetable extracts to comply with environment and social concerns. Although tara tannins have been used in the leather industry and its properties are well known, the work aims to optimize formulations using tara as a pretanning agent. Combinations with a naphthalene sulphonic syntan are used to obtain an innovative wet-white recipe considering shrinking temperature, tensile strength, tensile elongation, tear load and lightfastness properties as statistical variables.

  • Design of dehydration and stabilization process for biopelt

     Sorolla, Silvia; Sabé, Rosa; Adzet, José; Castell, Joan Carles; Bacardit Dalmases, Anna; Olle Otero, Luis
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2011-04-14
    Journal article

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    The aim of the present work is to generate at laboratory scale a biomaterial developed by in-vitro technology with similar characteristics to genuine leather. The generation of an in-vitro tissue from bovine fibroblasts is carried out using a scaffold to generate a three-dimensional extra-cellular matrix (3D ECM). The development of a biopelt is by an in-vitro production at lab scale in a bioreactor with specific culturing conditions.1 New methodologies to stabilize the biomaterial generated were investigated. In particular, the biomaterial was stabilized by immersion in solutions of vegetable tannins and cross-linking agents in an aqueous-solvent medium.

  • Desenvolupament d'un nou material col.lagenic semi-processat

     Sorolla Casellas, Sílvia
    Defense's date: 2011-12-23
    Department of Engineering Design, Universitat Politècnica de Catalunya
    Theses

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  • Modificación del pla mediante extrusión reactiva para la mejora del procesado, del comport de la fractura y de la prep de nanocomp

     Olle Otero, Luis; Bacardit Dalmases, Anna; Navarro Barbero, Rosa M.; Bou Serra, Jorge
    Participation in a competitive project

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  • Diseño de experimentos en ingeniería del cuero

     Bacardit Dalmases, Anna; Olle Otero, Luis
    Date of publication: 2011-09-01
    Book

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  • Comparison of the effect of the tropical test on both chrome-tanned and wet-white upholstery leather

     Olle Otero, Luis; Jorba Rafart, Montse; Font Vallès, Joaquim; Bacardit Dalmases, Anna
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2011
    Journal article

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    Automotive upholstery leather can undergo extreme environmental conditions that may cause premature ageing. Leather is strongly affected by three main environmental parameters: temperature,relative humidity and UV radiation. UV radiation causes colour change, fading, surface erosion, loss of gloss, etc. Increasing the levels of UV radiation represents a primary accelerating factor for leather ageing. Temperature produces thermal oxidation degradations, subsequent reaction rates and acceleration of other weathering reactions. Relative humidity acts as a chemical reagent in many hydrolytic weathering reactions and as a physical stressor of leather. Additionally, when relative humidity is over 65% leather is susceptible to mould attack. The aim of this work is to compare the effect of the tropical environment exposure on both chrometanned and wet-white upholstery leather.

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    Use of water-based carbonyl-functional polymers on a cross-linker-free highperformance leather finish  Open access

     Olle Otero, Luis; Urteaga, Eva; Font Vallès, Joaquim; Labastida, Luis; Bacardit Dalmases, Anna
    Afinidad: revista de química teórica y aplicada
    Date of publication: 2011-02
    Journal article

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    The present paper aims to study a new high-performance coating formulation while avoiding the use of cross-linkers. By using acrylic polymers with carbonyl functional groups, the negative environmental effects of the finishing process can be minimized. These new polymers can give very good physical properties without losing the inherent properties of flexibility and elasticity needed in upholstery leather

  • Determination of functional groups of humic derivatives as tanning-retanning agents

     Bacardit Dalmases, Anna; Shendryck, Alexander; Morera Prat, Josep Maria; Bou Serra, Jorge; Olle Otero, Luis
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2011-11-28
    Journal article

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    Three types of humic acids of different sources have been analysed in order to quantify the functional groups that may be liable to react with the proteins of leather. The quantification serves to determine the extent to which each of these acids can be used as tanning or retanning agents. The three types of humid acids have been compared mathematically according to their content within the aforementioned functional groups. Humic acids have structures similar to those of vegetable tannins.

  • Biodegradation of wet-white leather

     Olle Otero, Luis; Jorba Rafart, Montse; Font Vallès, Joaquim; Shendrik, Alexander; Bacardit Dalmases, Anna
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2011
    Journal article

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    This paper deals with the study of the physical, chemical and biological processes associated with the deterioration of wet-white leather. The samples of leather were exposed for eight months to outdoor weathering and then their properties were subsequently evaluated. The results indicate that resistance and dimensional stability of wet-white (THPS-syntan) leather is higher than that of chrometanned leather. The comparative work with chrome leather was described earlier.

  • Biodegradation of leather tanned with inorganic salts

     Bacardit Dalmases, Anna; Jorba Montse, Montse; Font Vallès, Joaquim; Shendrik, Alexander; Olle Otero, Luis
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2011-04-14
    Journal article

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    This paper aims to evaluate the physical, chemical and biological processes associated with the deterioration of leather tanned with inorganic salts. The samples of leather were exposed during eight months to outdoor weathering, and then their properties were evaluated. The results indicate that biodegration starts with dehydration, a partial scission of the protein chain of the collagen, detanning and a loss of oils due to volatilization and/or decomposition.

  • Optimizing a sustainable and innovative wet-white process with Tara Tannins

     Castell, Joan Carles; Fabregat, Cristina; Sorolla, Silvia; Solano, D; Olle Otero, Luis; Bacardit Dalmases, Anna
    Journal of the American Leather Chemists Association
    Date of publication: 2011-10-05
    Journal article

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    This study considers the fruit of the tara tree (Caesalpinia spinosa) as a sustainable source for tanning agents and proposes alternatives to the commercial mineral salts and vegetable extracts to comply with an increasing demand that concers low carbon footprint raw materials and health safety. Although tara tannins have been used in the leather industry and its properties being well known, the experimental part of the work aims to optimize innovative formulations using tara as wet-white pre-tanning agent. Combinations with naphthalene sulphonic and phenol condensation syntans will be used for wet white. Experiments have been designed by Simplex with centroids statistical calculations to obtain an optimized formulation. Tests are evaluated determining shrinkage temperature, tensile strenght, elongation, tear resistance and light fastness.

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    Comparación del envejecimiento debido a la exposición a un ambiente tropical artificial y exposición directa a la intemperie  Open access

     Olle Otero, Luis; Cobos, Mireia; Font Vallès, Joaquim; Bacardit Dalmases, Anna
    Congreso de la Asociación Química Española de la Industria del Cuero
    Presentation's date: 2010-05-08
    Presentation of work at congresses

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    El cuero para tapicería de automóvil puede ser sometido a condiciones ambientales extremas produciendo su envejecimiento prematuro. Los factores más importantes en la degradación del cuero durante su exposición ambiental son la temperatura, la humedad relativa y la radiación UV. La radiación UV causa cambios de color, desteñidos, erosión de la superficie, pérdida de brillo, etc. El incremento de la radiación UV representa el primer factor acelerador del envejecimiento. La temperatura produce degradaciones oxidativas con posteriores reacciones que aceleran otras reacciones de envejecimiento. La humedad relativa actúa como un reactivo químico en diversas reacciones hidrolíticas de degradación y como acelerador de la pérdida de propiedades físicas del cuero. Adicionalmente, cuando la humedad realtiva es superior a 65% el cuero puede ser atacado por hongos. El objectivo de este trebajo es estudiar el efecto de la exposición de un cuero wet-white para tapicería a un ambiente tropical artificial y compararlo con los efectos obtenidos debido a una exposición directa a la intemperie. Mediante el incremento de los niveles de los tres factores críticos que producen el envejecimiento prematuro del cuero se podrá profundizar mejor en el estudio de los mecanismos de degradación del mismo.

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    Estudio del envejecimiento de la piel debido a la exposición directa a la intemperie  Open access

     Bacardit Dalmases, Anna; Cobos, Mireia; Font Vallès, Joaquim; Olle Otero, Luis
    Congreso de la Asociación Química Española de la Industria del Cuero
    Presentation's date: 2010-05-08
    Presentation of work at congresses

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    Un cuero para tapicería se considera un producto de alta tecnología que se puede utilizar en diversos sectores: mobiliario, automoción, aviación y naval. Sin embargo, para cada uno de estos sectores se exgen diferentes especificaciones de calidad. En el caso de tapicería para automóvil, la piel puede ser sometida a comdiciones ambientales agresivas que pueden provocar su envejecimiento prematuro. Aunque se han llevado a cabo distintos estudios sobre el deterioro de la piel, la mayor parte de éstos se han centrado en piel vegetal proveniente de los Museos y Centros de Conservación de la Piel. También se han realitzado trabajos sobre el envejecimiento de la piel sobre piel curtida al cromo, pero éstos se desarrollaron utilizando métodos de envejecimiento acelerado. No obstante, estudios realizados en otros sectores, como pueden ser el de plásticos y/o textiles, no han hallado ninguna correlación significativa entre los diferentes ensayos de laboratorio de envejecimiento acelerado y la exposición directa a la intemperie. El objectivo de este trebajo es estudiar el efecto de la exposición directa a la intemperie sobre dos tipos de piel para tapicería: piel curtida al cromo y piel curtida wet-white. La comparación de las propiedades analizadas en los dos tipos de piel muestran que mientras en la piel curtida al cromo, la pérdida de propiedades debida al envejecimiento se produce a los 40 días de exposición ambiental, en la piel curtida wet-white, la degradación empieza entre los 80-120 días.

  • Epoxy resin Cross-linked binders in aqueous finishing

     Bacardit Dalmases, Anna; Cobos, Mireia; Borràs Riba, Eulàlia; Olle Otero, Luis
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2010-02-22
    Journal article

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  • Design of scaffolds for biopelt from tanning sector by-products

     Sorolla Casellas, Sílvia; Jorba, Montse; Marginet, Xavier; Castell, Joan Carles; Olle Otero, Luis; Bacardit Dalmases, Anna
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2010-09-30
    Journal article

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    The aim of the present work is to generate by in vitro technology at laboratory scale a biomaterial with similar characteristics to genuine leather. The generation of an in vitro tissue from bovine fibroblasts is carried out on the basis of a scaffold to generate a three-dimensional extra-cellular matrix (3D ECM). Finally, the scaffolds have to be suitable for biomaterial production at lab scale using a bioreactor with specific culturing conditions. In a further step, new methodologies to stabilize the new biomaterial were investigated. The biomaterial generation involves the elimination of the heavy water consumption steps in conventional leather manufacture. Since this biopelt doesn’t need to be subjected to the beamhouse steps previous to stabilization, a reduction of 50-60% in water consumption is achieved. Consequently, pollution in wastewaters is minimized. In view of the nature of this work and the necessary explanatory work, some of the detail has been placed in appendices at the end of the paper. (M.K.L.)

  • Study of cross-linking reactions on butadiene binders in aqueous finishing

     Bacardit Dalmases, Anna; Shendrik, Alexander; Combalia Cendra, Felip; Jorge Sanchez, Juan; Olle Otero, Luis
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2010-12-14
    Journal article

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    Butadienes, like acrylic binders and polyurethanes, can be cross-linked to improve their wet fastness properties. Nowadays, four types of cross-linkers for leather finishing are available: polyaziridines,polyisocyanates, polycarbodiimides and epoxy compounds. The aim of this study is to compare the mechanism of reaction of these four types of cross-linkers and the possibility of using a polysilane as a cross-linking agent for butadienes. A comparison of results shows that all cross-linkers studied improve wet rub fastness. However, polyaziridine and polysilane emerge as the most effective crosslinkers for butadiene binders.

  • Effect of ultrasound on several chromium tanning parameters

     Morera Prat, Josep Maria; Bartolí Soler, Esther; Serrano Montes, Mónica; Combalia Cendra, Felip; Borràs Riba, Eulàlia; Olle Otero, Luis; Bacardit Dalmases, Anna
    Journal of the American Leather Chemists Association
    Date of publication: 2010-05
    Journal article

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    This work studies the effect of several variables on a series of properties of the final leather obtained from chrome tanning, using ultrasounds as the sole mechanical effect during the tanning operation. The variables studied (at two levels by means of a 23 factorial design) are tanning temperature, condition of chrome offered (solid or dissolved) and salt basicity. Our studies indicate that the results obtained measuring parameters such as struck-through time of tanning agent, chromium uptake and its distribution, shrinkage temperature, tensile strength, tear load, grain distension and leather burst distention significantly depend on the previously selected level of one or more of the variables being studied. The study of the evolution of the concentration and basicity of the chromium salts has led us to conclude that reutilization is possible. Results show that ultrasound use in chrome tanning is a possibility to consider in the case of leather goods in which the use of drum may not be advisable.

  • Behavior of leather as a protective heat barrier and fire resistant material

     Bacardit Dalmases, Anna; Borràs Fillat, Maria Dolors; Soler Solé, Jaume; Herrero, Vicente; Jorge Sanchez, Juan; Olle Otero, Luis
    Journal of the American Leather Chemists Association
    Date of publication: 2010-02-11
    Journal article

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    Leather is a natural material with many applications: automotive, domestic upholstery, buildings, aviation, maritime, personal safety, etc. For each of these sectors, fire behavior is a field of particular interest. Unfortunately, there are many testing methods and different flammability standards depending on material application and end use. Therefore, there are different ways of approaching the whole flammability issue. In this work, different approaches for analyzing the fire resistance of leather are examined: (i) influence of the type of tannage, (ii) influence of the type of leather, (iii) influence of the type of retannage, (iv) influence of the type of fatliquor, and (v) influence of the use of flame retardants. The results indicate that leather presents natural fire resistance. However, the type of leather, type of tannage, retannage and fatliquor effect the flammability behavior of leather. In addition, the use of flame retardants slightly improves the smouldering properties of leather.

  • Polysilane cross-linked binders for aqueous finishing

     Olle Otero, Luis; Shendrick, Alexander; Combalia Cendra, Felip; Jorge Sanchez, Juan; Bacardit Dalmases, Anna
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2010-06-17
    Journal article

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    This study explores the cross-linking reaction between an epoxy functional alkoxysilane and both the leather industry, it can be used in finishing processes. A comparison of results indicates that such cross-linker presents a better cross-linking reaction rate than polyaziridine, polyisocyanate, epoxy resin and polycarbodiimide

  • Aqueous finishing with polycarbodiimide cross-linked binders

     Bacardit Dalmases, Anna; Olle Otero, Luis; Borràs Fillat, Maria Dolors; Cobos, Mireia; Jericó, Albert; Solé, Oriol
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2010-06-17
    Journal article

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    In the current economic climate leather factories need to redesign their processes to add value to their production in order to increase their competitiveness. In this respect, the use of a cross-linker opens up opportunities for the leather industry to obtain both high performance and eco-friendly articles. This study explores the cross-linking reaction between a polycarbodiimide and both acrylic resins and polyurethanes. A comparison of results shows that polycarbodiimide is a very selective cross-linker since it presents both different reticulation speeds and different cross-linking reaction rates depending on the type of binder employed. In addition, and depending on the type of tanned/retanned leather used, different amounts of polycarbodiimide are required in order to obtein optimum results.

  • Determination of dimethylfumarate in leather and footwear by solid-phase micro extraction and gas chromatography-mass spectrometry

     Cuadros Domènech, Rosa Maria; Font Vallès, Joaquim; Reyes Reyes, Maria; Olle Otero, Luis; Marsal Monge, Agustín
    Journal of the American Leather Chemists Association
    Date of publication: 2010-12-01
    Journal article

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    In the last two years, Europe has experienced a rise in skin allery and dermatitis due to goods and Asian provenance that have been treacted with dimethylfumarate (DMFU). Accordingly,laboratories in the leather and foodwear sectors have been obliged to develop analytical methods to determine the presence of this substance given de absence of an official method. The ban on DMFU as laid down in Decision 2009/251 of the European Union establishes a maximun concentration of DMFU in products of 0.1 mg/Kg. A simple nom-destructive rapid method based on manual headspace solid-phase micro extraction (HS-SPME) and gas cromatography-mass spectrometry (GC-MS)is proposed to detect DMFU in leather and footwear. Thereafter, the samples which DMFU is detected are analysed by solid-liquid extraction (SLE) with acetone after which DMFU is quantitatively determined by GC-MS. The quantitative method in validated in terms of linearity, precision, sensivity and recovery; demostrating its reliability. Quantification of this performed used naphthalene-D8 as internal standard. The detection limits are 0.005 mg/Kg and 0.03 mg/Kg for the HS-SPME-GC-MS and SLE-GC-MS methods, respectively. Given that these limits are bellow the maximun limit of 0.1 mg/Kg imposed by the European Union, the proposed methods are suitable for determining DMFU content in real samples.

  • Study of the effect of temperature, relative humidity and UV radiation on wet-white leather ageing

     Bacardit Dalmases, Anna; Cobos, Mireia; Font Vallès, Joaquim; Jorge Sanchez, Juan; Olle Otero, Luis
    Journal of the American Leather Chemists Association
    Date of publication: 2010-10-01
    Journal article

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    Since upholstery leather is considered a very high-tech product, a long service life is expected by the costumer. However, this type of leather can undergo extreme environmental conditions that may cause premature ageing. This work deals with the study of the effect of temperature, relative humidity, and UV radiation on leather ageing. Leathers with wet-white tannage were exposed to weathering effects using a climatic chamber in order to identify the most important variables affecting this weathering process and to check for interactions. Both a multilevel centralized factorial experimental design and an analysis of variance (ANOVA) have been employed as statistical tools for estimating the effects of the parameters.

  • Study of aqueous patent leather finish with a pull-up effect

     Bacardit Dalmases, Anna; Olle Otero, Luis; Morera Prat, Josep Maria; Bartolí Soler, Esther; Cuadros Domènech, Rosa Maria; Cobos, M
    Journal of the American Leather Chemists Association
    Date of publication: 2009-03
    Journal article

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  • Lower Pollution Pickle-Chrome process: A no-float/low-salt approach

     Bacardit Dalmases, Anna; Olle Otero, Luis; Morera Prat, Josep Maria; Bartolí Soler, Esther; Palomares, H; Borràs, Md
    Journal of the Society of Leather Technologists and Chemists
    Date of publication: 2009-04
    Journal article

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