The combination of reducing agents/iron as environmentally friendlier alternatives for Co-based driers in the drying of alkyd paints

Micciché, F Fabrizio; Oostveen, E. A.; Haveren, van J.; Linde, van der R Rob

doi:10.1016/j.porgcoat.2004.12.008

Cited by 38 publications

(25 citation statements)

References 5 publications

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“…Film hardness provides an index to appraise the drying of linseed oil, normally measured with a pendulumdamping test (Miccichè et al 2005a). The test measures a number of pendulum swings required for dampening the amplitude of the pendulum oscillations, to a defined level.…”

Section: Parameters and Indices Assessing Progress Of Oxidation Of LImentioning

confidence: 99%

“…This recorder consists of hemispherically ended needles, moving along the length of the test strip, which is made from plain glass and coated with a thin film. The drying characteristics of paint film are classified into four stages: the paint flows together (wet-edge time), the paint begins to polymerise (dust-free time), surface dries and finally lines become no longer visible on the film (total drying or through drying time) (Miccichè et al 2005a (Klaasen & van der Leeuw 2006). Clearly, assessing the drying of film suffers from subjective evaluation.…”

Section: Parameters and Indices Assessing Progress Of Oxidation Of LImentioning

confidence: 99%

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Low temperature oxidation of linseed oil: a review

et al. 2012

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This review analyses and summarises the previous investigations on the oxidation of linseed oil and the self-heating of cotton and other materials impregnated with the oil. It discusses the composition and chemical structure of linseed oil, including its drying properties. The review describes several experimental methods used to test the propensity of the oil to induce spontaneous heating and ignition of lignocellulosic materials soaked with the oil. It covers the thermal ignition of the lignocellulosic substrates impregnated with the oil and it critically evaluates the analytical methods applied to investigate the oxidation reactions of linseed oil. Initiation of radical chains by singlet oxygen ( 1 Δ g ), and their propagation underpin the mechanism of oxidation of linseed oil, leading to the self-heating and formation of volatile organic species and higher molecular weight compounds. The review also discusses the role of metal complexes of cobalt, iron and manganese in catalysing the oxidative drying of linseed oil, summarising some kinetic parameters such as the rate constants of the peroxidation reactions. With respect to fire safety, the classical theory of self-ignition does not account for radical and catalytic reactions and appears to offer limited insights into the autoignition of lignocellulosic materials soaked with linseed oil. New theoretical and numerical treatments of oxidation of such materials need to be developed. The self-ignition induced by linseed oil is predicated on the presence of both a metal catalyst and a lignocellulosic substrate, and the absence of any prior thermal treatment of the oil, which destroys both peroxy radicals and singlet O 2 sensitisers. An overview of peroxyl chemistry included in the article will be useful to those working in areas of fire science, paint drying, indoor air quality, biofuels and lipid oxidation.

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Section: Parameters and Indices Assessing Progress Of Oxidation Of LImentioning

confidence: 99%

Section: Parameters and Indices Assessing Progress Of Oxidation Of LImentioning

confidence: 99%

Low temperature oxidation of linseed oil: a review

et al. 2012

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“…Results were further improved by the addition of Imidazole (Im) as a ligand. 25 The results in Table 6 show that the catalyst is not immediately effective after mixing iron and ascorbic acid palmitate, but that it needs some standing or incubation time after mixing to become active.…”

Section: Cobalt-free Drying Catalystsmentioning

confidence: 99%

Resins and additives for powder coatings and alkyd paints, based on renewable resources

et al. 2007

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Due to limited fossil resources and an increased need for environmentally friendly, sustainable technologies, the importance of using renewable feedstocks in the paint and coatings area will increase in the decades to come. This paper highlights some of the perspectives in this area. Alkyd resins for high-solid paints and reactive diluents, completely based on commercially available renewable resources, were prepared and characterized. Alkyd resins based on sucrose and unsaturated fatty acids or oils showed a low intrinsic viscosity, making them suitable to be used in high-solid alkyd paints. Reactive diluents based on similar starting materials showed excellent properties with regard to thinning behavior and effect on drying characteristics. Powder coating polyester resins were synthesized, starting from isosorbide and diacids. Polyester resins with glass transition temperatures up to 70°C were obtained. Incorporation of small amounts of other diols and trifunctional components was found to improve color and coating properties. In order to create completely renewable resin systems, the development of renewable drying agents for alkyds and crosslinkers for powder coatings is in progress.

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“…O octanoato de ferro foi avaliado, comparativamente a secantes comerciais de cobalto e manganês, na presença de um agente redutor (ácido ascórbico-6-palmitato) e de ligantes quelatos, buscando uma alternativa de substituição aos secantes de cobalto. O sistema ferro/agente redutor acelerou o tempo de secagem e conduziu à formação de filme mais duro e a adição dos ligantes 2-etil-4-metilimidazole (Im) e N,N-bis (2-etil-5-metil-imidazol-4-il metil)aminopropano (BIAP) apresentou efeito positivo sobre o processo de secagem 128 .…”

Section: Polimerização Oxidativa De óLeos Vegetais E Resinas Alquídicasunclassified

Transformação de triglicerídeos em combustíveis, materiais poliméricos e insumos químicos: algumas aplicações da catálise na oleoquímica

Suarez¹,

Meneghetti²,

Meneghetti³

et al. 2007

Quím. Nova

170

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Recebido em 7/4/06; aceito em 3/7/06; publicado na web em 26/3/07 TRANSFORMATION OF TRIGLYCERIDES INTO FUELS, POLYMERS AND CHEMICALS: SOME APPLICATIONS OF CATALYSIS IN OLEOCHEMISTRY. The use of biomass as raw-material for obtaining chemicals, polymers and fuels is emerging as a clever alternative solution for the increasing energy demand, environmental awareness and petroleum shortage. In this work, some attempts in order to develop catalytic systems suitable for triglyceride transformation into fuels, polymers and intermediates are reviewed.Keywords: oleochemistry; catalysis; biofuels. INTRODUÇÃOHistoricamente a biomassa foi largamente empregada como fonte de obtenção de diversos materiais, tais como fibras, polímeros e combustíveis, e este interesse pode ser atribuído ao seu caráter renovável e sua ampla disponibilidade 1 . Com a expansão da indús-tria do petróleo, a biomassa perdeu sua importância devido à obtenção e desenvolvimento de materiais com propriedades diferenciadas, a custos competitivos 1,2 . Cabe salientar que em alguns segmentos, a biomassa manteve sua posição em razão da sua natureza renovável, ampla disponibilidade, biodegradabilidade ou baixo custo, como no caso das fibras de algodão e lã, da borracha natural, do etanol combustível e das tintas à base de resinas alquídicas. No entanto, o constante aumento na demanda por fontes de energia, a ampliação da consciência ecológica e o esgotamento das reservas de petróleo de fácil extração, aliado a um possível desenvolvimento econômico-social, têm incentivado pesquisas no sentido de desenvolver novos insumos básicos, de caráter renovável, para diversas áreas de interesse industrial 3,4 . Neste contexto, os óleos e as gorduras animais e vegetais (triglicerídeos), in natura ou modificados, têm tido um papel importante em muitos segmentos, tais como materiais poliméricos, lubrificantes, biocombustíveis, revestimentos, adesivos estruturais, entre outros.Devido às diferentes funcionalidades presentes em sua estrutura química (Esquema 1), os triglicerídeos, que são derivados de ácidos graxos, exibem uma grande versatilidade reacional 5 . Este potencial químico pode ser aproveitado para preparação de vários materiais com inúmeras aplicações comerciais, sendo que muitos dos processos químicos de transformação dos triglicerídeos ocorrem na presença de espécies químicas em quantidades catalíticas e, em muitos casos, quasi-estequiométricas. Estas espécies, por não estarem associadas ao produto final, são consideradas como catalisadores.O objetivo deste trabalho é apresentar uma revisão bibliográfi-ca de alguns processos de transformação de óleos vegetais mediados por catalisadores. Não se pretende aqui abranger toda a ampla contribuição da catálise para a oleoquímica, mas abordar os principais aspectos que envolvem o uso de catalisadores, mesmo quando empregados em teores não-catalíticos, em alguns processos de grande interesse da área, tais como aqueles envolvendo a obtenção de biocombustíveis, insumos químicos e macromoléculas. BIOCOMBUSTÍVEISO uso de óleos...

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The combination of reducing agents/iron as environmentally friendlier alternatives for Co-based driers in the drying of alkyd paints

Cited by 38 publications

References 5 publications

Low temperature oxidation of linseed oil: a review

Low temperature oxidation of linseed oil: a review

Resins and additives for powder coatings and alkyd paints, based on renewable resources

Transformação de triglicerídeos em combustíveis, materiais poliméricos e insumos químicos: algumas aplicações da catálise na oleoquímica

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