Vytvrzování močovino formaldehydových adhesiv hydrolysátem kolagenního typu v kyselém prostředí

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F04%3A63502580" target="_blank" >RIV/70883521:28110/04:63502580 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Curing of Urea- formaldehyde Adhesives With Collagen Type Hydrolsates Under Acid Condition

Popis výsledku v původním jazyce

Condensation of dimethylol urea and its mixtures with urea or hydrolysate of chrome- tanned leather waste ( mass fraction in mixture 0.05) in presence of variable quantity of phtalic acid, as acid curing agent ( with mass fraction limits 0.01 - 0.1) wasstudied through TG technique. During condensation of sole dimethylol urea or its mixtures with urea, oxymethylene as well as methylene cross- links are produced at a ratio of approx. 1:1, presence of leather waste hydrolysate reduces this ratio to approx. 2:1 in favour of more stable methylene bridges. Higher concentration of phtalic acid ( above mass fraction 0.05) leads to formation of a new TG mass decrement wave in the 150 -180 oC temperature interval, which probably relates to transition of more unstable oxy-methylene bridges to more stable methylene bridges, with splitting off formadehyde. Oxy-methylene bridges may be regarded as a potential source of formaldehyde emissions by cured urea-formaldehyde adhesive films. Hydrolysates o

Název v anglickém jazyce

Curing of Urea- formaldehyde Adhesives With Collagen Type Hydrolsates Under Acid Condition

Popis výsledku anglicky

Condensation of dimethylol urea and its mixtures with urea or hydrolysate of chrome- tanned leather waste ( mass fraction in mixture 0.05) in presence of variable quantity of phtalic acid, as acid curing agent ( with mass fraction limits 0.01 - 0.1) wasstudied through TG technique. During condensation of sole dimethylol urea or its mixtures with urea, oxymethylene as well as methylene cross- links are produced at a ratio of approx. 1:1, presence of leather waste hydrolysate reduces this ratio to approx. 2:1 in favour of more stable methylene bridges. Higher concentration of phtalic acid ( above mass fraction 0.05) leads to formation of a new TG mass decrement wave in the 150 -180 oC temperature interval, which probably relates to transition of more unstable oxy-methylene bridges to more stable methylene bridges, with splitting off formadehyde. Oxy-methylene bridges may be regarded as a potential source of formaldehyde emissions by cured urea-formaldehyde adhesive films. Hydrolysates o

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2004

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Thermal Analysis and Calorimetry

ISSN

1418-2874

e-ISSN

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Svazek periodika

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Číslo periodika v rámci svazku

76

Stát vydavatele periodika

HU - Maďarsko

Počet stran výsledku

9

Strana od-do

1015-1023

Kód UT WoS článku

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EID výsledku v databázi Scopus

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