Odpornost lesa modificiranega s sredstvom Meldur-DMES proti glivam modrivkam

diplomsko delo - visokošolski strokovni študij

Janez Rot (Author), Miha Humar (Reviewer), Franc Pohleven (Mentor)

Abstract

Izvedli smo modifikacijo lesa s sredstvom Meldur-DMES v kombinaciji s termično modifikacijo in preučili odpornost modificiranega lesa proti glivam modrivkam. Vzorce smo pripravili iz beljave bora (Pinus sylvestris) in beljave smreke (Picea abies) po standardu SIST EN 152. Modificirali smo jih v vakuumski komori pri različnih koncentracijah (5 % in 10 %) Meldurja, brez in s katalizatorjem. Modificirane vzorce smo pred izpostavitvijo glivam izprali po standardu SIST EN 84. Test smo izvedli z glivama, in sicer Aureobasidium pullulans in Sclerophoma pithyophila po standardu SIST EN 152. Po 6-tedenski izpostavitvi smo vzorcem vizualno določili pomodrelost površine. Ugotovili smo, da je pri višji koncentraciji modifikacijskega sredstva (10 % raztopina z dodatkom katalizatorja) in pri višji temperaturi (170 °C) dosežena višja stopnja odpornosti lesa proti glivam modrivkam. Izjema so vzorci beljave bora, modificirani pri temperaturi 170 °C, ki so brez kemične modifikacije dosegli popolno odpornost pred obarvanjem z glivami modrivkami.

Keywords

les;modifikacija;Meldur-DMES;WPC;glive modrivke;

Data

Language:	Slovenian
Year of publishing:	2009
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[J. Rot]
UDC:	630*844.1
COBISS:	1760649
Views:	1039
Downloads:	286
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Resistance of Meldur-DMES modified wood against blue stain fungi
Secondary abstract:	Modification of wood was carried out with Meldur-DMES in a combination with a thermal modification, so as the resistance of modified wood to blue fungi was analysed. The samples were prepared from the sapwood of a pine tree (Pinus sylvestris) and from the sapwood of a spruce (Picea abies) according to the SIST EN 152 standard. They were modified in a vacuum-chamber at different Meldur concentrations (5 % and 10 % solution) with and without a catalyst. The modified samples were washed out according to the SIST EN 84 standard before their exposal to fungi. The test was carried out according to the SIST EN 152 standard with 2 fungi, Aureobasidium pullulans and Sclerophoma pithyophila. After being exposed for 6 weeks, the portions of the surfaces turned blue were defined. It was found out that the higher level of resistance of wood to the blue fungi was achieved at a higher concentration of Meldur, 10 % solution with the addition of a catalyst and at higher temperature (170 °C). The exceptions are the samples of a spruce tree, modified at temperature of 170 °C, which achieved a complete resistance to the colouring with the blue fungi.
Secondary keywords:	wood;modification;Meldur-DMES;WPC;blue stain fungi;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fakulteta, Odd. za lesarstvo
Pages:	XIII, 84 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:	21695