Stabilizacija lesa s sredstvom Meldur

diplomsko delo - visokošolski strokovni študij

Benjamin Jurič (Author), Miha Humar (Reviewer), Franc Pohleven (Mentor)

Abstract

Skladno s smernicami varstva okolja strokovnjaki razvijajo človeku in okolju manj škodljive postopke zaščite, ki pa naj bi učinkovito ščitili les pred biotičnimi dejavniki razgradnje. Tako v zadnjem času za potrebe modifikacije lesa razvijajo postopek modifikacije z vodotopno smolo - dimetilol-dihidroksietilenureo (DMDHEU), ki se v tekstilni industriji že vrsto let uporablja za modifikacijo celuloznih vlaken v bombažnih tkaninah. Želeli smo preveriti ali je les, modificiran s tem sredstvom, komercialno imenovanim Meldur, odporen proti razkroju z glivami. Modificirane vzorce smo, v skladu s standardom SIST EN 113 (1995), izpostavili 5 vrstam lesnih gliv. Vzorce smrekovine in bukovine smo izpostavili delovanju navadne tramovke, bele hišne gobe, kletne gobe, pisane ploskocevke in ogljene kroglice. Rezultati so pokazali, da so bili modificirani vzorci smrekovine odporni proti razgradnji z glivami navadne tramovke in bele hišne gobe. Prav tako je modifikacija z 10 % raztopino sredstva Meldur omogočila učinkovito zaščito vzorcev smrekovine proti pisani ploskocevki. Modificirani vzorci bukovine, izpostavljeni beli hišni gobi in pisani ploskocevki, so izgubili več mase kot testni vzorci. Le vzorci bukovine, izpostavljeni temperaturi 150 °C v kombinaciji z 10 % raztopino sredstva Meldur, so dosegli želeno zaščito pred razkrojem z glivo ogljeno kroglico. Na splošno modifikacija smrekovine in bukovine s sredstvom Meldur les dobro zaščiti pred razgradnjo z glivami rjave trohnobe, manj pa pred glivami bele trohnobe.

Keywords

stabilizacija lesa;derivat imidazola (DMDHEU);lesne glive;navadna tramovka;bela hišna goba;kletna goba;pisana ploskocevka;ogljena kroglica;

Data

Language:	Slovenian
Year of publishing:	2010
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[B. Jurič]
UDC:	630*841
COBISS:	1839241
Views:	1290
Downloads:	338
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Stabilization of wood by Meldur agent
Secondary abstract:	In accordance to the development and guidelines of environment protection, protection procedures which are less harmful to humans and environment but nevertheless efficiently protecting wood against biotic factors of decay were developed. For the purpose of wood modification, nowadays the wood modification water soluble resin - dimethyilol-dihydroxyethyleneurea (DMDHEU) -is being developed, and has already been used for many years in the textile industry for modification of cellulose in cotton fabric. It was researched whether the wood modified with this agent, known under the brand name Meldur, was resistant to wood decay caused by fungi. In accordance to the amended standard SIST EN 113 (1995), the modified samples were exposed to 5 fungi species. The spruce and beech wood samples were exposed to the influence of the following fungi: Gloeophyllum trabeum, Antrodia vaillantii, Coniophora puteana, Trametes versicolor and Hypoxylon fragiforme. The results showed that the modified spruce wood samples were very efficiently protected against the decay caused by Gloeophyllum trabeum and Antrodia vaillantii fungi. Similarly, the modification with 10 % concentration of Meldur at 2 modification temperatures protected the spruce wood samples against Trametes versicolor as it was expected. The mass loss of beech wood samples exposed to Antrodia vaillantii and Trametes versicolor was higher compared to test samples. Only the modification of the beech wood samples with 10 % concentration of Meldur at 150 °C achieved the expected protection against Hypoxylon fragiforme. In general, the modification of spruce and beech wood with Meldur sufficiently protects wood against the decay caused by brown rot fungi while it is less effective against white rot fungi.
Secondary keywords:	stabilization of wood;imidazole derivate (DMDHEU);wood decay fungi;Gloeophyllum trabeum;Antrodia vaillantii;Coniphora puteana;Trametes versicolor;Hypxylon fragiforme;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	IX, 45 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:	21919