Vpliv deleža utekočinjenega lesa v urea-formaldehidnem lepilu na lastnosti ivernih plošč

diplomsko delo - univerzitetni študij

Aleksandra Potisek Križ (Author), Milan Šernek (Reviewer), Sergej Medved (Mentor)

Abstract

V zadnjih letih je opazen porast raziskav na področju rabe utekočinjenega lesa, predvsem kot goriva oz. kot surovine za izdelavo poliuretanskih pen. Preučevali smo možnost nadaljnje uporabe utekočinjenega lesa in sicer kot vezivnega sredstva za iverne plošče. V laboratorijskih pogojih smo izdelali 3-slojne iverne plošče z različnim deležem utekočinjenega lesa (10 %, 20 %, 30 %, 40 %, 50 %, in 75 %). Les je bil utekočinjen po polihidrični metodi. Opazovali smo razslojno trdnost, čvrstost površine, debelinski nabrek in vsebnost prostega formaldehida, ki smo ga določali po perforator metodi. Razslojna trdnost in čvrstost površine se izboljšata, če je delež utekočinjenega lesa 10 % oz. 20 %. Pri debelinskem nabreku pa utekočinjeni les ne zmanjša absorbcije vode, ampak jo celo poveča. Vsebnost prostega formaldehida se močno zmanjša: najnižjo vrednost pa dosežemo z dodatkom 20 % utekočinjenega lesa.

Keywords

utekočinjen les;iverna plošča;UF lepilo;razslojna trdnost;čvrstost površine;debelinski nabrek;formaldehid;

Data

Language:	Slovenian
Year of publishing:	2009
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[A. Potisek Križ]
UDC:	630*862.2
COBISS:	1759369
Views:	1173
Downloads:	317
Average score:	0 (0 votes)
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Other data

Secondary language:	English
Secondary title:	Impact of share of liquefied wood in urea-formaldehyde adhesive on properties of particleboards
Secondary abstract:	In the last few years, there is a noticeable increase in research of liquefied wood, used for fuel or as a raw material for polyurethane foam production. The possibilities of further usage of liquefied wood, as an adhesive for particleboards, were examined. In the laboratory conditions 3-layer particleboards with various portions of liquefied wood (10 %, 20 %, 30%, 40 %, 50 % and 75 %) were prepared. The wood was liquefied according the polyhydric method. We studied internal bond, surface soundness, thickness swelling and emission of free formaldehyde, determined by perforator procedure. It was found out that the internal bonds and surface soundness improved by addition of 10 % or 20 % liquefied wood. Concerning the thickness swelling, liquefied wood does not reduce the absorption of water, on the contrary, it does increase it. Emission of free formaldehyde highly reduces: the lowest level is gained by adding 20 % of liquefied wood.
Secondary keywords:	liquefied wood;particleboard;UF adhesive;internal bonds;surface soundness;thickness swelling;formaldehyde;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fakulteta, Odd. za lesarstvo
Pages:	VIII, 54 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:	21658