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Curing urea-formaldehyde adhesives with hydrolysates of chrome-tanned leather waste from leather production

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dc.title Curing urea-formaldehyde adhesives with hydrolysates of chrome-tanned leather waste from leather production en Langmaier, Ferdinand Kolomazník, Karel Mládek, Milan Šívarová, Jarmila
dc.relation.ispartof International Journal of Adhesion and Adhesives
dc.identifier.issn 0143-7496 OCLC, Ulrich, Sherpa/RoMEO, JCR 2005-04
utb.relation.volume 25
utb.relation.issue 2
dc.citation.spage 101
dc.citation.epage 108
dc.type article
dc.language.iso en
dc.publisher Elsevier Science, Ltd. en
dc.identifier.doi 10.1016/j.ijadhadh.2004.04.004
dc.subject adhesives for wood en
dc.subject thermal analysis en
dc.subject cure/hardening en
dc.subject environmental issues en
dc.subject hydrolysates of chrome-tanned leather waste en
dc.description.abstract Non-isothermal thermogravimetry was applied to study the condensation kinetics of dimethylol-urea (DMU) as a model substance for methylol oligomers of urea in the presence, or absence, of an acid curing agent (phthalic acid), and of blends of DMU with urea and with the hydrolysate of chrome-tanned leather waste. Kinetics of the formation of oxymethylene and methylene bonds were evaluated, using the Arrhenius equation to obtain the parameters. Addition of a mass fraction of 0.05 H to DMU reduces the rate of formation of unstable oxymethylene cross-links in favour of more stable methylene bonds by 20-30%. Acid curing agents accelerate the rate of formation of both types of cross-links, but at the same time markedly affect transformation of oxymethylene cross-links to methylene cross-links. Reducing the content of oxymethylene cross-links in cured aminoplast adhesive films, to control their instability, may lower the levels of formaldehyde emissions by cured aminoplast-type films. (C) 2004 Elsevier Ltd. All rights reserved. en
utb.faculty Faculty of Technology
utb.identifier.scopus 2-s2.0-7544219928
utb.identifier.wok 000225139300002
utb.identifier.coden IJAAD
utb.source j-wok 2011-08-16T15:06:17Z 2011-08-16T15:06:17Z
utb.contributor.internalauthor Langmaier, Ferdinand
utb.contributor.internalauthor Kolomazník, Karel
utb.contributor.internalauthor Mládek, Milan
utb.contributor.internalauthor Šívarová, Jarmila
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