Fungicidna učinkovitost lesa, modificiranega s sredstvom Meldur

diplomsko delo

Anton Tisovec (Author), Miha Humar (Reviewer), Franc Pohleven (Mentor)

Abstract

Skladno z razvojem in smernicami varstva okolja razvijajo postopke zaščite, ki so manj škodljivi človeku in naravi, učinkovito pa naj bi ščitili les pred biotskimi dejavniki. Tako v zadnjem času za potrebe modifikacije lesa razvijajo vodotopno smolo dimetilol-dihidroksietilenurea (DMDHEU), ki se v tekstilni industriji že vrsto let uporablja za modifikacijo celuloznih vlaken v bombažnih tkaninah. Pri raziskavi smo želeli preveriti ali je les modificiran s tem sredstvom, ki ima komercialno ime Meldur, odporen na glivni razkroj. Modificirane vzorce lesa smo, v skladu z modificiranim standardom SIST EN 113, izpostavili 4 vrstam lesnih gliv. Smrekove vzorce lesa smo izpostavili navadni tramovki in beli hišni gobi, bukove pa pisani ploskocevki in ogljeni kroglici. Modificirani vzorci so izkazali zelo učinkovito zaščito proti navadni tramovki in beli hišni gobi. Pri bukovini izpostavljeni pisani ploskocevki je bila izguba mase vzorcev s koncentracijo 5 in 10 % Meldur-ja ter temperaturo modifikacije 150 °C pod 3 %. Modificirani bukovi vzorci, izpostavljeni ogljeni kroglici, pa niso imeli niti malo izboljšane odpornosti in so v nekaterih primerih izgubili celo več mase kot kontrolni vzorci. Ugotovili smo, da je sredstvo Meldur dobro zaščitilo les pred glivami rjave trohnobe, manjšo zaščito pa izkazuje proti glivam bele trohnobe.

Keywords

derivat imediazola (DMDHEU);lesne glive;bela hišna goba;navadna tramovka;ogljena kroglica;pisana ploskocevka;

Data

Language:	Slovenian
Year of publishing:	2008
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[A. Tisovec]
UDC:	630*841
COBISS:	1644937
Views:	1156
Downloads:	250
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Fungicidal efficacy of Meldur modified wood
Secondary abstract:	In accordance with the development and directives of environment protection, protection procedures were developed, which are less harmful to humans and nature, but nevertheless, efficiently protect wood against biotic factors of decay. For the purpose of wood modification, water soluble resin dimethylol-dihydroxyethyleneurea (DMDHEU) is being developed, and is already used for many years in the textile industry for modification of cellulose in cottons textile. The aim of this research was to check if the wood, modified with this agent, also known under the brand name Meldur, is resistant to wood decay fungi. In accordance with the modified SIST EN 113 standard, the modified samples of wood were exposed to 4 different species of wood decay fungi. Spruce wood samples were exposed to Gloeophyllum trabeum and Antrodia vaillantii, while beach ones to Trametes versicolor and Hypoxylon fragiforme. The modified samples showed effective resistance against Gloeophyllum trabeum and Antrodia vaillantii. At beach wood, exposed to Trametes versicolor, the mass loss of samples, modified with 5 % and 10 % concentration of Meldur at modification temperature 150 °C, was below 3 %. Modified beach samples, exposed to Hypoxylon fragiforme, did not exhibit any resistance against fungal degradation, and sometimes lost even more mass as control samples. The results showed that the agent Meldur is resistant to brown rot fungi, while it is less effective against white rot fungi.
Secondary keywords:	imidazole derivat (DMDHEU);wood decay fungi;Antrodia vaillantii;Gleoophyllum trabeum;Hypoxylon fragiforme;Trametes versicolor;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Diplomsko delo, Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	XI, 46 f., [11 f. pril.]
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:	21381