Aleš Ugovšek (Author), Milan Šernek (Author)

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.

Keywords

diferenčna dinamična kalorimetrija;fenol-formaldehidna lepila;katalizator;utrjevanje;

Data

Language: Slovenian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL BF - Biotechnical Faculty
UDC: 630*824.86
COBISS: 2097289 Link will open in a new window
ISSN: 0024-1067
Parent publication: Les
Views: 1224
Downloads: 425
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: English
Secondary title: Curing of commercial phenol-formaldehyde adhesives
Secondary 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.
Secondary keywords: differential scanning calorimetry;phenol-formaldehyde adhesives;catalyst;curing;
File type: application/pdf
Type (COBISS): Not categorized
Pages: str. 321-326
Volume: ǂLet. ǂ64
Issue: ǂšt. ǂ11/12
Chronology: 2012
ID: 9151620