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Utrjevanje komercialnih fenol-formaldehidnih lepil
Ugovšek, Aleš (Author), Šernek, Milan (Author)

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Abstract
Fenol-formaldehidna lepila se v lesni industriji najpogosteje uporabljajo za izdelavo konstrukcijskih lesnih kompozitov, kjer se zahteva visoka trdnost in trajnost lepilnega spoja. Utrjevanje fenol-formaldehidnih lepil je zaradi vzporednega poteka več reakcij precej zapleteno. Glede na kislost oziroma bazičnost dodanega katalizatorja v procesu sinteze se ta lepila delijo v smole tipa novolak in resol. V raziskavi je bilo z diferenčno dinamično kalorimetrijo (DSC) analizirano utrjevanje razliŽnih komercialnih fenol-formaldehidnih lepil tipa resol. Proučen je bil dodatek bazičnega katalizatorja na hitrost utrjevanja izbranega lepila in izdelana simulacija potrebnih časov utrjevanja tega lepila pri izotermnih pogojih. Ugotovljeno je bilo, da se potek utrjevanja različnih fenol-formaldehidnih lepil med sabo precej razlikuje. Ker so bila proučevana lepila v procesu sinteze že optimizirana z vidika koliŽine katalizatorja, je bilo naknadno dodajanje katalizatorja v izbrano fenol-formaldehidno lepilo nepotrebno in je negativno vplivalo na njegovo utrjevanje.

Language:Slovenian
Keywords:diferenčna dinamična kalorimetrija, fenol-formaldehidna lepila, katalizator, utrjevanje
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2012
Number of pages:str. 321-326
Numbering:Let. 64, št. 11/12
UDC:630*824.86
ISSN on article:0024-1067
COBISS.SI-ID:2097289 Link is opened in a new window
Views:749
Downloads:308
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Record is a part of a journal

Title:Les
Shortened title:Les
Publisher:UL, Biotehniška fakulteta, Oddelek za lesarstvo
ISSN:0024-1067
COBISS.SI-ID:13940224 This link opens in a new window

Secondary language

Language:English
Title:Curing of commercial phenol-formaldehyde adhesives
Abstract:
Phenol-formaldehyde adhesives are in the wood industry most commonly used for bonding of structural wood composites where high strength and durability of the bond line is desired. Their curing is rather complicated due to the reactions that can occur simultaneously. Based on the acidity or alkalinity of added catalyst during the synthesis, these adhesives are divided into novolak and resol type of resins. In the study, the curing of different commercial resol type phenol-formaldehyde adhesives was analysed with differential scanning calorimetry (DSC). The influence of the addition of basic catalyst on the curing of the selected adhesive was examined, and a simulation of time required for the curing of the adhesive at isothermal conditions was also made. It was found that the curing processes of different adhesives varied. Because the examined phenol-formaldehyde adhesives were already optimised during the process of synthesis by means of optimal catalyst addition, the additional amount of catalyst into selected phenol-formaldehyde adhesive was unnecessary and has a negative impact on its curing.

Keywords:differential scanning calorimetry, phenol-formaldehyde adhesives, catalyst, curing

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