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

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.

scholarly journals Preparation and characterization of polydopamine/melamine microencapsulated red phosphorus and its flame retardance in epoxy resin

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20391-20402
Author(s):  
Chen Cheng ◽  
Yanling Lu ◽  
Weining Ma ◽  
Shaojie Li ◽  
Jun Yan ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Shell Structure ◽  
Composite Shell ◽  
Intumescent Flame Retardant ◽  
Smoke Suppression ◽  
Flame Retardance ◽  
Red Phosphorus ◽  
Composite Shell Structure

Red phosphorus was coated by a polydopamine/melamine composite shell structure, which constituted an intumescent flame retardant with superior flame retardance and smoke suppression performance for epoxy resin.

scholarly journals Effects of Graphene Nanoplatelets on Mechanical and Fire Performance of Flax Polypropylene Composites with Intumescent Flame Retardant

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 4094
Author(s):  
Imran Ali ◽  
Nam Kyeun Kim ◽  
Debes Bhattacharyya
Keyword(s):  
Flame Retardant ◽  
Decomposition Rate ◽  
Natural Fiber ◽  
Fire Retardant ◽  
Graphene Nanoplatelets ◽  
Intumescent Flame Retardant ◽  
Fume Hood ◽  
Fire Dynamics ◽  
Polypropylene Composites ◽  
Set Up

The integration of intumescent flame-retardant (IFR) additives in natural fiber-based polymer composites enhances the fire-retardant properties, but it generally has a detrimental effect on the mechanical properties, such as tensile and flexural strengths. In this work, the feasibility of graphene as a reinforcement additive and as an effective synergist for IFR-based flax-polypropylene (PP) composites was investigated. Noticeable improvements in tensile and flexural properties were achieved with the addition of graphene nanoplatelets (GNP) in the composites. Furthermore, better char-forming ability of GNP in combination with IFR was observed, suppressing HRR curves and thus, lowering the total heat release (THR). Thermogravimetric analysis (TGA) detected a reduction in the decomposition rate due to strong interfacial bonding between GNP and PP, whereas the maximum decomposition rate was observed to occur at a higher temperature. The saturation point for the IFR additive along with GNP has also been highlighted in this study. A safe and effective method of graphene encapsulation within PP using the fume-hood set-up was achieved. Finally, the effect of flame retardant on the flax–PP composite has been simulated using Fire Dynamics Simulator.

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