Sorpcijske lastnosti lesa zaščitenega z bakrovimi pripravki ali termično modifikacijo v vakuumu : diplomsko delo (visokošolski strokovni študij)

Vavkman, Marko (author), Humar, Miha (mentor), Gorišek, Željko (reviewer)

Za določitev sorpcijskih lastnosti zaščitenega lesa smo izdelali vzorce iz smrekovine. Del vzorcev smo vakuumsko impregnirali s pripravki na osnovi bakrovega(II) sulfata in etanolamina (CuS, CuSEA, CuSEAQBOK) 2 različnih koncentracij, ostale pa termično modificirali pri 180 °C, 195 °C, 210 °C, 225 °C, 240 °C. Vse vzorce smo izpostavili 5 klimam z različno relativno zračno vlažnostjo (33 %, 44 %, 65 %, 88 %, 98-100 %) ter izračunali adsorpcijske in desorpcijske krivulje. Na povečano higroskopnost vzorcev poleg bakrovega(II) sulfata in etanolamina dodatno vplivajo še ostale komponente: bor, kvartarna amonijeva spojina in oktanojska kislina. Pri vseh klimah izpostavitve imajo vsi termično modificirani vzorci nižje ravnovesne vlažnosti kot pa kontrolni in neobdelani vzorci.Ugotovili smo, da so pri termični modifikaciji sorpcijske lastnosti v tesni povezavi z izgubo mase. Višja kot je, večja je izguba mase; posledično je manjša tudi ravnovesna vlažnost vzorcev in s tem dovzetnost za higroskopičnost.

• Language: Slovenian
• Keywords: les, zaščita lesa, baker, amini, modifikacija, sorpcija, desorpcija, vlažnost lesa
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [M. Vavkman]
• Year: 2006
• Number of pages: XIV, 58 f., [20 f. pril.]
• PID: 20.500.12556/RUL-156
• UDC: 630*841
• COBISS.SI-ID: 1453705
• Publication date in RUL: 11.07.2014

Secondary language

• Language: English
• Title: Sorption properties of copper treated wood or thermally modified wood in vacuum : graduation thesis (higher professional studies)

Abstract

To elucidate sorption properties of preserved wood, Norway spruce wood specimens were prepared. One half of the specimens was treated with copper(II)sulphate and ethanolamine based wood preservatives (CuS, CuSEA, CuSEAQBOK) of 2 different concentrations, and the other modified at 180 °C, 195 °C, 210 °C, 225 °C, 240 °C. All the specimens were exposed in chambers with different air humidity (33 %, 44 %, 65 %, 88 %, 98-100 %). Afterwards, adsorption and desorption curves were calculated. Results indicate that besides copper(II) sulphate and ethanolamine other components of preservative solution like boron, quaternary ammonium compound and octanoic acid, have influence on increased hygroscopic properties of impregnated wood. On the other, all thermally modified specimens exhibited lower equilibrium moisture in comparison to control unmodified wood. There is a significant correlation between sorption properties and mass losses caused by thermal treatment. Higher temperatures of modification result in higher mass losses, what is reflected in lower equilibrium moisture content and hygroscopic properties.

• Keywords: wood, wood preservation, copper, amine, modification, sorption, desorption, moisture content