Utrjevanje različnih frakcij utekočinjenega lesa

diplomski projekt

Jure Zakrajšek (Author), Ida Poljanšek (Reviewer), Marko Petrič (Mentor), Franc Budija (Co-mentor)

Abstract

Zaradi okoljevarstvenih zahtev potekajo različne raziskave v smeri iskanja in priprave okolju prijaznejših premazov za les, ki bi bili alternativa klasičnim pripravkom za površinsko obdelavo lesa. Tako bi za premaze lahko uporabljali tudi utekočinjen les, ki ga pridobivamo s termokemičnim postopkom (s solvolizo). Vendar je pomanjkljivost filmov iz utekočinjenega lesa v tem, da so temno rjave oz. črne barve, kar močno omejuje njihovo uporabnost. V diplomskem projektu smo skušali pripraviti svetlejši utekočinjen les s postopkom ultrafiltracije. Z že uveljavljenim postopkom utekočinjanja smo utekočinili lipov les in ga nato ultrafiltrirali. Ugotovili smo, da je barva ultrafiltriranega utekočinjenega lesa precej bolj svetla od izhodiščne utekočinjene zmesi. Naši rezultati tudi nakazujejo, da bi bilo možno svetlejši ultrafiltriran utekočinjen les, kljub njegovi različni sestavi od nefiltriranega lesa, utrditi. Za iskanje najprimernejših pogojev utrditve ultrafiltrirnega utekočinjenega lesa so potrebne nadaljnje raziskave, da bi lahko pripravili svetle filme s sprejemljivimi fizikalno kemijskimi in odpornostnimi lastnostmi.

Keywords

utekočinjen les;ultrafiltracija;infrardeči spektri;barva;

Data

Language:	Slovenian
Year of publishing:	2012
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[J. Zakrajšek]
UDC:	630*813
COBISS:	2047113
Views:	1525
Downloads:	246
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Curing of various fractions of liquefied wood
Secondary abstract:	Because of environmental demands, various investigations are carried out in order to find and prepare environmentally friendly wood coatings, as an alternative to conventional formulations for surface treatment of wood. So, wood coatings could be prepared also from liquefied wood, obtained by a thermochemical process (solvolysis). However, the drawback of liquefied wood based coatings is in their dark brown to black colour, importantly limiting their applicability. In this thesis, attempts to prepare light liquefied wood by means of ultrafiltration are described. Lime-tree wood was liquefied by the established procedure and the liquefaction product was ultrafiltered. We stated that the colour of ultrafiltered wood was quite lighter that that of the starting liquefaction mixture. Our results also indicated that the light coloured ultrafiltered liquefied wood could be cured. Additional investigations are needed to find the most appropriate curing conditions to be able to prepare light coloured films with acceptable physical, chemical and resistance properties.
Secondary keywords:	liquefied wood;ultrafiltration;infrared spectra;colour;
Type (COBISS):	Diploma project paper
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	VIII, 32 f.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;
ID:	22201