Određivanje stepena vatrootpornosti furnirske ploče termogravimetrijom, deo I - bukova furnirska ploča

Abstract

Osnovni motiv ovog rada je sve naglašenija potreba za furnirskim pločama otpornim na vatru. U ovom radu, bukovi furniri su impregnisani rastvorima izabranih vatrootpornih sredstava, a to su: diamonijum fosfat (DF) monoamonijum fosfat (MF), natrijum acetat (NA), vodeno staklo (VS), natrijum tetraborat (NT) i borna kiselina (BK). Da bi se preliminarno odredio dostignuti nivo vatrootpornosti još kod furnira, pre izrade gotovih ploča primenjene su termogravimetrijska (TG) i derivativna termogravimetrijska (DTG) metoda. TG i DTG analize za tretirano i netretirano drvo kao i za sama vatrootporna sredstva su izvedene na Perkin-Elmer TGS-2 termogravimetrijskom uređaju. Vatrootpornost ploča je testirana prema standardnom testu otpornosti prema dejstvu vatre i kao najefikasnija sredstva su se pokazala isto MF i NT kao i kod TG/DTG analiza, što ukazuje na validnost termogravimetrijske metode u predviđanju uspešnosti vatrootpornog sredstva u budućem proizvodu.

The basic motive of this work is the ever more pronounced need for fire-resistant plywood. In this work, beech veneers have been impregnated with solutions of chosen fire retardants, which are diammonium phosphate monoammonium phosphate, sodium acetate, water glass, sodium tetra borate and boric acid. To determine the preliminary level of fire retardancy achieved in veneers before manufacturing of finished plywood, thermo gravimetric (TG) and derivative thermogravimetric (DTG) methods are used. TG and DTG analyses of treated and untreated wood, as well as of fire retardants alone, were performed on a Perkin-Elmer TGS-2 thermo gravimetric equipment. Fire resistance of plywood was tested in accordance with standard test for resistance to the effects of fire and the most efficient fire retardants monoammonium phosphate and sodium tetra borate, had the same results as TG/DTG analyses, which points out the validity of TG methods in predicting success of fire retardants in future products.