Study of the kinetics of thermal and thermal-oxidative destruction of treated with flame retardants and untreated wood (Part 2)

2020 ◽  
pp. 55-62
Author(s):  
Николай Петрович Копылов ◽  
Александр Евгеньевич Кузнецов ◽  
Елена Юрьевна Сушкина ◽  
Владимир Васильевич Яшин
Keyword(s):  
Flame Retardant ◽  
Forest Fires ◽  
Flame Retardants ◽  
Oxidative Degradation ◽  
Fire Retardant ◽  
Untreated Wood ◽  
Oxidative Destruction ◽  
Smoke Aerosol ◽  
Kinetics Of ◽  
Thermo Oxidative Degradation

Проведена серия экспериментов по оценке огнезащитного действия антипиренов на древесину. Исследования выполнены для бишофита на специально созданной экспериментальной установке. Кинетика выделения дымового аэрозоля изучалась с помощью фотометра фотоэлектрического ФАН, а для проведения количественных расчетов абсолютных значений дымовых аэрозолей применялся отбор проб на фильтры АФА-ВП. Количественные оценки скоростей различных стадий термической и термоокислительной деструкции получены методом формально-кинетического расчета. The choice of flame retardants as additives to water when extinguishing forest fires should be based on a preliminary (laboratory) study of their fire-retardant properties for wood, determining the mechanisms of fire-retardant action. Evaluation of the effectiveness of a particular flame retardant can be carried out by studying the kinetics of thermal and thermo-oxidative degradation of treated and untreated wood. The purpose of this work is to supplement the method for evaluating the fire-retardant effect of flame retardants solutions with methods for studying the rates of smoke aerosol release and its amount during thermal and thermo-oxidative destruction of wood. Quantitative rate estimates of various stages of thermal and thermo-oxidative degradation are obtained by the method of formal kinetic calculation based on experimental data on the rates of smoke aerosol release. The calculation showed that treatment with flame retardants (in this case MgCl) reduces the activation energy of dehydration and depolymerization processes from 83.68 to 75.31 kJ/mol (for 8% solutions) and to 58.58 kJ/mol (for 35% solutions). This indicates that the halides of magnesium are as catalysts of dehydration in the present case. Kinetic analysis allows to conclude that the treatment of wood with flame retardant (MgCl) reduces the amount of smoke aerosol released during thermal degradation, and at the same time it accelerates the processes of heterogeneous oxygen enrichment of substances on the surface of the carbonized residue.

Investigation in the kinetics of thermal and thermo-oxidative degradation of wood treated with fire-retardants and untreated wood

2020 ◽  
pp. 24-29
Author(s):  
Николай Петрович Копылов ◽  
Александр Евгеньевич Кузнецов ◽  
Елена Юрьевна Сушкина ◽  
Владимир Васильевич Яшин
Keyword(s):  
Forest Fires ◽  
Flame Retardants ◽  
Degradation Products ◽  
Cellulose Degradation ◽  
Oxidative Degradation ◽  
Fire Retardant ◽  
Untreated Wood ◽  
Fire Retardants ◽  
Kinetics Of ◽  
Thermo Oxidative Degradation

Разработана экспериментальная методика определения механизма огнезащитного действия антипиренов на основе изучения кинетики термической и термоокислительной деструкции древесины. Отработка методики проведена на антипирене MgCl (бишофит). Методика основывается на количественной оценке при термическом разложении древесины выхода продуктов деструкции: CO, CO, дымового аэрозоля. В качестве приборной базы используются хроматографы, фотометр фотоэлектрический для аэрозолей, спектрофотометр. Water with various additives is used during extinguishing forest fires. Fire-retardants are used as additives in most cases. The selection of fire-retardants depends on the level of increase in extinguishing effectiveness at their addition to water. The purpose of this work is to develop an experimental method for evaluating the fireproof effect of flame retardants solutions. This method is based on the investigation of the kinetics of thermal and thermo-oxidative degradation of treated wood with flame retardants and untreated wood. In practice, bischofite and diammonium phosphate are often used as additives. Investigations were conducted using MgCl (bischofite). The explanation of the fireproof effect of the bischofite solution is based on the study of the yield of decomposition products (CO, CO, smoke aerosol) of wood treated with fire-retardant and untreated wood. The instrument base includes chromatographs «Gasochrom 3101», «Tsvet 152», photoelectric photometer for aerosols, spectrophotometer IKS-29. Wood samples were subjected to thermal and thermo-oxidative degradation in nitrogen flow or air flow with a volume velocity of 60 ml · min. Pulse heating in the pyrolysis furnace was carried out in the temperature range from 350 to 550 °C. The significant increase in fire resistance of wood treated with fire-retardant was found as a result of researches using the proposed method. It was shown that the theory of the coating layer, thermal and gas theory of catalytic dehydration are not suitable for explaining the mechanism of fireproof action of an aqueous solution of magnesium halides. Although it is not excluded the inhibition of gas-phase oxidation of cellulose degradation products by hydrogen halides released when heating aqueous solutions of magnesium halides.

A novel intumescent flame-retardant LDPE system and its thermo-oxidative degradation and flame-retardant mechanisms

2008 ◽  
Vol 19 (11) ◽  
pp. 1566-1575 ◽  
Author(s):  
Yun Liu ◽  
De-Yi Wang ◽  
Jun-Sheng Wang ◽  
Yan-Peng Song ◽  
Yu-Zhong Wang
Keyword(s):  
Flame Retardant ◽  
Oxidative Degradation ◽  
Intumescent Flame Retardant ◽  
Thermo Oxidative Degradation

Kinetics of thermo-oxidative degradation of polymer blends based on polylactide

2019 ◽  
Author(s):  
M. V. Podzorova ◽  
Yu. V. Tertyshnaya ◽  
A. A. Popov ◽  
S. G. Nikolaeva
Keyword(s):  
Polymer Blends ◽  
Oxidative Degradation ◽  
Kinetics Of ◽  
Thermo Oxidative Degradation

scholarly journals CeO2-dolomite as fire retardant additives on the conventional intumescent coating in steel substrate for improved performance

2019 ◽  
Vol 268 ◽  
pp. 04009 ◽  
Author(s):  
Joshua Zoleta ◽  
Gevelyn Itao ◽  
Vannie Joy Resabal ◽  
Arnold Lubguban ◽  
Ryan Corpuz ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Photoelectron Spectroscopy ◽  
Flame Retardants ◽  
Steel Substrate ◽  
Morphological Structure ◽  
Fire Retardant ◽  
Carbon Chain ◽  
Binding Energies ◽  
Fire Exposure ◽  
Improved Performance

Multiple combinations of CeO2-Dolomite as fillers and Intumescent Flame Retardant (IFR) ingredients were used to optimize the intumescent coatings designed for I-beam steel substrates. The influenced of fillers and various combinations of flame-retardants on the fire protective performance of the coatings were evaluated using vertical Bunsen burner fire test and various characterization techniques. Formula C and Formula F having 1:1 and 2:2 CeO2-Dolomite ratio, obtained the lowest substrate temperature around 150oC and 150.4oC, respectively after 90 minutes fire exposure. Also, the morphological structures of intumescent char observed by SEM-EDX, demonstrated that Formula C and Formula F stimulated the formation of homogeneous and more compacted surface structure. X-ray photoelectron spectroscopy (XPS) provide the binding energies of C and O constituents, it was observed that [-(C2H4)n-] was the most important free radical as it could promote the formation of aromatic carbon chain in the char surface. Finally, the findings of this study revealed that the selection of appropriate fillers and combinations of flame-retardant ingredients significantly influenced the morphological structure of the char layer, of which, Formula C and Formula F produced a char with higher thermal stability, resulting to a more fire resistive IFR coating during fire exposure.

scholarly journals Self-Extinguishing Resin Transfer Molding Composites Using Non-Fire-Retardant Epoxy Resin

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2554 ◽  
Author(s):  
Zhi Geng ◽  
Shuaishuai Yang ◽  
Lianwang Zhang ◽  
Zhenzhen Huang ◽  
Qichao Pan ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Flame Retardants ◽  
Resin Transfer Molding ◽  
Fire Retardant ◽  
Functional Materials ◽  
Building Blocks ◽  
Fire Retardancy ◽  
Limiting Oxygen Index ◽  
Transfer Molding ◽  
Halogen Free

Introducing fire-retardant additives or building blocks into resins is a widely adopted method used for improving the fire retardancy of epoxy composites. However, the increase in viscosity and the presence of insoluble additives accompanied by resin modification remain challenges for resin transfer molding (RTM) processing. We developed a robust approach for fabricating self-extinguishing RTM composites using unmodified and flammable resins. To avoid the effects on resin fluidity and processing, we loaded the flame retardant into tackifiers instead of resins. We found that the halogen-free flame retardant, a microencapsulated red phosphorus (MRP) additive, was enriched on fabric surfaces, which endowed the composites with excellent fire retardancy. The composites showed a 79.2% increase in the limiting oxygen index, a 29.2% reduction in heat release during combustion, and could self-extinguish within two seconds after ignition. Almost no effect on the mechanical properties was observed. This approach is simple, inexpensive, and basically applicable to all resins for fabricating RTM composites. This approach adapts insoluble flame retardants to RTM processing. We envision that this approach could be extended to load other functions (radar absorbing, conductivity, etc.) into RTM composites, broadening the application of RTM processing in the field of advanced functional materials.

Infrared Analysis on Pyrolysis Products of Flame Retardant Rigid Polyurethane Foam

2014 ◽  
Vol 1033-1034 ◽  
pp. 900-906
Author(s):  
Ze Jiang Zhang ◽  
Li Jun Li ◽  
Feng Li ◽  
Jin He ◽  
Zi Qiong Gan
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foam ◽  
Magnesium Hydroxide ◽  
Hydrogen Cyanide ◽  
Flame Retardants ◽  
Fire Retardant ◽  
Infrared Analysis ◽  
Antimony Trioxide ◽  
Stretching Vibration ◽  
Flame Retarded

Infrared spectra of the pyrolysis gases of polyurethane foam flame retarded by MPOP, MP, MC, magnesium hydroxide, or antimony trioxide flame retardants was analyzed online by FTIR method. At 600°C, the polyurethane foam flame retarded by MPOP, MP, MC, magnesium hydroxide or antimony trioxide flame retardants released more hydrogen cyanide than the pure polyurethane foam, proved that the MPOP, MP, MC and magnesium hydroxide flame retardants could change the law that the polyurethane released hydrogen cyanide. At 600 °C, the peak of C=O stretching vibration at 1730cm-1did not appear for the flame-retardant polyurethane, indicating that the flame retardants can make the polyurethane rapidly carbonize and the fewer C=O intermediate was produced. The absorbent peaks of the fire-retardant samples at 1604cm-1, 1538 cm-1, 1250 to 1230 cm-1and 1450cm-1implied that the flame retardants could delay the oxidative decomposition of the polyurethane component at 600 °C, so that more components may be carbonized. When increasing the pyrolysis temperature, the perlite would make polyurethane foam release fewer hydrogen cyanide.

Kinetics of thermal oxidative degradation of phosphorus-containing flame retardant copolyesters

2002 ◽  
Vol 76 (3) ◽  
pp. 401-409 ◽  
Author(s):  
Bo Wu ◽  
Yu-Zhong Wang ◽  
Xiu-Li Wang ◽  
Ke-Ke Yang ◽  
Yong-Dong Jin ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation ◽  
Phosphorus Containing ◽  
Kinetics Of
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