Treatment Of Wood With Flame Retardants And Study On The Thermal Degradation Of Treated Wood

This thesis consists of three chapters.In the first chapter, the type, effect and development of flame retardants on treatment of wood were reviewed, as well as the resent studies on the thermal degradation of wood treated with flame retardants. The purpose, significance and result in this paper were also summarized. Fifty-five references were cited.In the second chapter, wood was treated by inorganic compounds, guanyl compounds and phosphate salt of guanyl urea. The flame retardance and thermal degradation of wood treated with flame retardants were studied in air by thermal analysis, IR, limiting oxygen index and char yield. Compared with pure wood, in the treated wood, there is (a) lowering in thermal degradation onset temperature, (b) increase in limiting oxygen index, (c) increase in char yield, and (d) decrease in energies of activation. Effect of the different elements on degradation behaviors has been proposed. During the process of thermal degradation of wood, phosphorus can catalyze dehydration and thermal degradation of wood, and nitrogen can catalyze the reaction of dephosphorylation and acid-catalyzed dehydration of wood, while hydrogen chloride or hydrogen bromide formed in the thermal decomposition as radical scavengers block the process of flame which leads to slow down major weight loss, and the effect of boron on thermal degradation of the sample is very little, it physically protect wood.In the third chapter, the flame retardance of hemp fabric treated with inorganic compounds and polyacrylonitrile (PAN) fabric treated with metal-containing flame retardants were characterized by systemic analysis methods, and thermal degradation behavior of treated hemp fabric was minutely studied. From the different properties of pure and treated fabric, we know that the flame retardance of treated fabric was greatly improved. Moreover, the flame retardant mechanism and effects on the thermal degradation of samples for different element were proposed.