Gorljivost termično modificiranega in z borovimi pripravki impregniranega lesa : diplomsko delo - visokošolski strokovni študij

Ramovš, Rok (author), Pohleven, Franc (mentor), Humar, Miha (reviewer)

Les je, kot naravni material, vnetljiv in gorljiv. Ker ga je zato treba ustrezno zaščititi proti gorenju, smo preizkušali najnovejše postopke termične modifikacije lesa ter impregnacijo z okolju prijaznejšimi sredstvi kot so borove učinkovine. Ugotoviti smo želeli, kakšna je gorljivost termično modificiranega lesa. Les smo impregnirali z 1, 5 ter 10 % vodno raztopino Topbora. Impregniran kot neimpregniran les smo nato še dodatno termično modificirali v vakuumu pri temperaturi 150, 170, 190, 210, 230 °C. Za testiranje gorljivosti lesa smo uporabili modificirano ameriško metodo ASTM: E69-50 (1965). Rezultati so pokazali, da so kontrolni vzorci v 4,28 min izgubili 75 % lesne mase. Pri modificiranem lesu pa smo najboljši rezultat zabeležili pri temperaturi modificiranja 210 °C ter 10 % vodno raztopino Topbora, kjer so vzorci v 4,16 min izgubili le 32 % mase. Ugotovili smo, da se gorljivost modificiranega lesa zniža samo z dodatkom Topbora. Pri neimpregniranem modificiranem lesu je odstotek izgube lesne mase nižji ali enak kot pri kontrolnih vzorcih.

• Language: Slovenian
• Keywords: les, gorenje, modifikacija lesa, bor, gorljivost
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [R. Ramovš]
• Year: 2009
• Number of pages: IX, 63 f.
• PID: 20.500.12556/RUL-396
• UDC: 630*841.1
• COBISS.SI-ID: 1751945
• Publication date in RUL: 11.07.2014

Secondary language

• Language: English
• Title: Combustibility of thermally modified and with boron preparations of impregnated wood : graduation thesis - higher professional studies

Abstract

Wood is a natural material, inflammable and combustible material. Considering this fact it is necessary to utilise proper flame retardants. The latest procedures of thermal modification of wood and impregnation with environmentally friendly biocides such as boron compounds were tested. Our purpose was to find out the combustibility of thermally modified wood. Wood was impregnated with 1, 5 and 10 % Topbor based aqueous solutions. The impregnated so as not impregnated wood was then further thermally modified in the vacuum at 150, 170, 190, 210 and 230 °C. For testing, a modified American method ASTM E 69-50 (1965) was utilised. Control samples lost 75 % of wood mass in 4.28 min. At the modified wood, the best results are reported after modification of samples impregnated with 10 % Topbor aqueous solution at 210 °C, where the samples lost only 32 % of the weight in 4.16 min. It was found out that the burning behaviour of the modified wood was reduced only by the addition of boron. When not impregnated, the percentage of loss of wood mass is comparable to the control specimens.

• Keywords: wood, combustion, wood modification, boron, combustibility