A Study On Combustion And Flame Retardancy Of Polymer Materials

Polymer materials (Polymer materials), repeated connections made by many of thesame, simple structure unit by covalent high molecular weight (typically up to10to106)compounds. Such as polyvinyl chloride molecules are connected together by the vinylchloride molecular structural unit-CH2CHCl-repeat, it is an emerging widespread use ofmaterials, in particular, is now mostly used in wall insulation materials such thermalconductivity relatively low polymer, such as: insulation panels of polystyrene, phenolic resins,polyethylene insulation board, polyurethane and other polymer materials, but because of itsinherent flammability, the use of the premises fire risk greatly increased.As the culprit of theCCTV fire and other fires. Energy-saving insulation materials used in the exterior wall,exterior energy-saving insulation materials used by the Shanghai scene of the fire scene foampolyurethane and some polystyrene board, poor flame resistance of this material, the burningspeed, and produce excessive melting drops accelerated the fire, and burning will release largeamounts of carbon monoxide, even if residents were burned to death, will be poisoned.Therefore, how to correctly evaluate the combustion and flame retardant properties underactual fire conditions has become an imminent, the most important issue.The main subject of the introduction of four new generation of laboratory polymercombustion of materials properties and flame retardance evaluation method-cone calorimeter(BY CONE), the monomer combustion analyzer (SBI), oxygen bomb apparatus and oxygenindex analyzer. Cone calorimeter experimental results closer to the behavior of the polymermaterial in the actual burning; the monomer burning fire simulation experiments are neutral,and better reflect the polymer combustion model in the fire and the release of heat; by oxygenbomb measured the heat of combustion value of the polymer can theoretically give the energyof the polymer material has, and how much the risk of fire and kinetic energy in the fire;oxygen index, oxygen, nitrogen mixed gas stream, the determination required just to maintaincombustion the minimum oxygen concentration, so it is assessed.An important means ofprogram-level flammable, but also an important indicator to measure combustible. Discussedin detail the meaning and application of a variety of combustion parameters in the evaluationand research of polymer materials, combustion and flame retardant, and describes the progress and direction of development.Research include:①study the oxygen index, conecalorimeter (CONE), SBI, oxygen bomb instrument determination of polymer fire evaluationand testing methods and results analysis;②a comparative study of combustion and flameretardant polyvinyl chloride, polyethylene, phenolic resins, polyurethane, polystyrene, andother widely used polymer materials;③polyvinyl chloride, polyethylene, phenolic resins,polyurethane, polystyrene, a large number of widely used polymeric materials flame retardantfor a preliminary study;④before and after a large number of widely used polymericmaterials flame retardant such as polyvinyl chloride, polyethylene, phenolic resins,polyurethane, polystyrene physical properties-thermal conductivity;⑤of smoke toxicity ofpolyvinyl chloride, polyethylene, phenolic resins, polyurethane, polystyrene, and other widelyused polymer materials, the mouse toxicity test.The innovation of this study is:①The first time the above polymer materials throughthe four different detection methods research;②the first synchronization of the flameretardancy of polymer materials and combustion performance;③a large number ofexperiments to establish polymerization Combustion rating of the fire performance andflame-retardant effect of the evaluation, specification wall insulation materials market has laida theoretical foundation, make some contribution to the cause of the fire.