Determination of Kinetic Parameters of Thermodestruction and Groups of Fireproof Efficiency of Pine Wood, Modified by Boron Nitrogen Flame Retardant

Abstract

Wood is a combustible material. To reduce combustibility, wood is modified with functional compounds of phosphorus, boron and nitrogen, inoculation of which changes the chemical composition of the surface layer of wood and its structure. The mechanism of action of flame retardants is related to their influence on the energy and entropy characteristics of the thermodestruction process. Considering that boron nitrogen compounds are effective flame retardants and react with wood components under “mild” conditions, the effect of grafting of a borax modifier on the kinetic parameters of wood thermal decomposition is studied. The kinetic parameters (activation energy and preexponent value) are determined by thermal analysis using TGA curves (integral method). A 50 % aqueous solution of monoethanolamine (N→B) trihydroxyborate is used as a modifier; samples of unmodified pine wood are used as controls. The experimental data obtained indicate that the surface modification of pine wood with boron nitrogen fire retardant provides the material with group II fire protection efficiency (modifier consumption-150g/m2). The flame retardant effect of the boron nitrogen modifier is associated with a lower value of the activation energy of its thermal destruction process. The contribution of the entropy factor in reducing the combustibility of modified wood is less expressed. The use of monoethanolamine (N→B) trihydroxyborate as a wood flame retardant is advisable in an oxidizing atmosphere.

Intensity and Direction of Dynamics of Soil Fertility Indicators in Landscape Farming

“…This is evidenced by the experience of the Belgorod region [6]. The impetus for large-scale work throughout the region was the effectiveness of landscape farming systems in the Krasnogvardeisky district, the development of which took place under the leadership of Academician of the Russian Academy of Agricultural Sciences O. G. Kotlyarova, starting in 1981 [2].…”

Dynamics of Soil Fertility Indicators in Protective Forest Plantations

“…The speed and direction of soil transformation under the influence of various types of vegetation in various natural and climatic conditions is not only of particular scientific interest, but also of agroeconomic interest due to the significant potential of the agricultural sector in the country's economy [5,6]. Afforestation is a powerful tool in solving the problem of global climate change due to carbon sequestration by the phytomass of woody and herbaceous vegetation, as well as the soils of protective plantings [3].…”