Research of Mechanism of Fire Protection with Wood Lacquer

Abstract

The effect of the composition on the weight loss of wood protected by a coating based on inorganic and organic substances in the process of thermal exposure, which is a feature of the study of the flame retardant effectiveness of the composition, is investigated. The solution of this problem is carried out by specially developed methods. The influence of fire protection under the influence of high-temperature heat flux on the change in the process of loss of mass of fire-protected wood is determined and the mechanism of kinetics of action of the composition is characterized, which is characterized by a decrease in the speed of flame propagation and mass loss. The results of thermogravimetric studies determined the weight loss of the coatings as a function of temperature, the results of which investigated the activation energy at the temperature decomposition of the coatings and found that for wood it was 36.56 kJ / mol, and in the case of fire protection it increased 2.3 times. which makes it possible to conclude that it is advisable to use lacquer varnish to improve the fire retardant efficiency of wood. Thus, for the specimen of fire-retardant lacquer wood, there is a gradual decrease in temperature, ie, the work of the coating is fixed, and, accordingly, the activation energy is increased during the decomposition of the wood. In order to establish the flame retardant efficiency in the application of high-temperature blowing lacquer, studies were conducted to determine the combustibility index of wood by mass loss, flame spread and temperature increase of flue gases and found that when processing wood goes to the group of combustible materials with a burning index.

Non-Isothermal Thermogravimetry of Selected Tropical Woods and Their Degradation under Fire Using Cone Calorimetry

“…Decomposition of wood in thermogravimetry works with small initial mass of the sample, and thus with the direct release of volatile decomposition products into gaseous phase. However, in a cone calorimetry burning with much higher initial mass, the back effect of the heat from cone heater on degradation products formed during burning may keep them beneath the upper carbonaceous layer [ 27 , 28 , 29 , 30 , 31 , 32 ].…”

Establishing regularities in the propagation of phase transformation front during timber thermal modification

“…The knowledge of the physical-chemical properties of such substances, their quality indicators, the mechanism that affects materials, would make it possible to select them considering economic indicators, the duration and safety of application, environmental aspects, etc. [2,3].…”

Improvements in Fire Resistance, Decay Resistance, Anti-Mold Property and Bonding Performance in Plywood Treated with Manganese Chloride, Phosphoric Acid, Boric Acid and Ammonium Chloride

“…Fire retardants which contain P, N and B have been the research hotspot in fire retardants for wood for their characteristics of being toxic-free, smoke-inhibiting, cheap and having good fire resistance. Nitrogen-phosphorus fire retardant provides good flame retardation effects to wood by thermal decomposition into non-flammable gases, lowering the thermal decomposition temperature and increasing the char-formation rate [7][8][9][10][11]. Borides are covered onto the wood surface after swelling and melting upon the contact of heat to isolate oxygen, thus realizing the goal of retarding flames by stopping combustion of wood [12].…”

“…The combination of these reagents and supplement develops a mutual, synergistic effect to accelerate the char-forming rate, thus inhibiting flame spreading and heat production and decreasing the output of toxic gases. As a result, the fire resistance of plywood was improved significantly (Figure 2), and no less than with similar flame retardants [7][8][9].…”