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Učinkovitost pripravkov na osnovi bora in etanolamina na lesne glive : diplomsko delo
Podlesnik, Boštjan (Author), Humar, Miha (Mentor) More about this mentor... This link opens in a new window, Pohleven, Franc (Reviewer)

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Abstract
Borove spojine so že v majhnih koncentracijah zelo učinkoviti biocidi, ki neznatno škodujejo na ljudi in okolje. Žal pa se v les slabo vežejo in se iz njega izpirajo. Za izboljšavo vezave in učinkovitosti smo jih kombinirali s kvartarnimi amonijevimi spojinami in etanolaminom. Kot vir bora smo uporabili boraks in borovo kislino. Standard SIST EN 1250 nam je služil za določanje vezave borovih spojin v les, SIST EN 113 za določanje učinkovitosti proti glivam razkrojevalkam, SIST EN 152 pa za določanje učinkovitosti proti glivam modrivkam. Vsi vzorci, razen tistih za določanje učinkovitosti proti modrivkam, so bili izdelani iz smrekovine in impregnirani s pripravki 3 različnih koncentracij bora in QUAT, in sicer 1,0 %, 0,5 % in 0,1 %. Ugotovili smo, da oba pripravka, tudi pri najnižji koncentraciji, zelo učinkovito delujeta proti glivam pravim razkrojevalkam, za zaščito pred glivami modrivkami pa so potrebne nekoliko višje koncentracije. Iz lesa se je v povprečju izpralo 52,6 % borovih učinkovin, kar je nekoliko nižja vrednost kot pri komercialnih pripravkih. Med impregnacijo z etanolaminskim pripravkom pride tudi do depolimerizacije lignina, kar je razvidno iz rumeno obarvanih izpirkov in FTIR spektrov lesa.

Language:Slovenian
Keywords:zaščita lesa, lesne glive, bor, etanolamin, razkroj, izpiranje, modrenje
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2007
Publisher:[B. Podlesnik]
Number of pages:XII, 58 f.
Place:Ljubljana
UDC:630*841
COBISS.SI-ID:1543049 This link opens in a new window
Views:867
Downloads:238
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Secondary language

Language:English
Title:Efficacy of boron and etanolamine based solutions on wood decay fungi : univerzitetni študij
Abstract:
Boron compounds are very effective biocides at relatively low concentrations. On the other hand they do have small negative impacts on human health and environment. Unfortunately, boron compounds do not react with wood, and therefore are prone to leaching. To improve fixation and efficacy, boron compounds were mixed with ethanolamine and quaternary ammonium compound (quat). Borax and boric acid were used as boron source. Standard SIST EN 1250 served as a guideline for fixation studies; SIST EN 113 procedure was used for fungal decay testing, and SIST EN 152 as protocol for blue stain experiments. All the specimens, with the exception of those used for blue stain testing, were made of Norway spruce wood. They were treated with aqueoussolution of the following boron and quat concentrations: 1.0 %, 0.5 % and 0.1 %. Even the specimens impregnated with preservative solution of the lowest concentration were resistant against decay, while higher concentration of active ingredients was necessary to preserve pine sapwood against blue staining. On average 52.6 % boron compounds leached from wood during the process of leaching, having a slightly better value compared to commercial wood preservatives. Furthermore, FTIR analysis showed that depolymerization of lignin appeared, but this phenomenon did not influence boron leaching.

Keywords:wood preservation, wood fungi, boron, ethanolamine, decay, leaching, blue staining

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