subject: Flame Retardant Flexible Polyurethane Foam On Pyrolysis - Flame Retardant, Flame Retardant, Fire [print this page] Facebook! Free to participate in opening ceremony
Summary : This selected phosphorus, chlorine, Boron, nitrogen and phosphorus - nitrogen flame retardant by way of impregnation of soft polyurethane foam processing, and thermal analysis, to test its thermal decomposition was found , flame retardant after the weight loss of soft polyurethane foam process becomes more complex, thermal decomposition of the apparent activation energy has significant influence, and found that sodium hexametaphosphate on the polyurethane foam has good flame-retardant effect .
1 Introduction Polyurethane foam as the hydrocarbon chains containing flammable, density, than the large area without fire-retardant treated polyurethane foam is flammable, fire burning and decomposition, produce large amounts of toxic smoke, to evacuate and great difficulties in fire fighting. Especially flexible polyurethane foam (FPUF) opening higher, more combustible components, combustion air flow due to higher supply of the steady stream of oxygen, flammable and difficult to extinguish, can easily cause major Qunsiqunshang fire, for example, in December 2000 all commercial buildings in the East Luoyang catastrophic fire, due to irregularities welding operations staff welding sparks splashed stock foam mattress, sofa and other combustible materials, the failure to control and spread to the fourth floor of Entertainment City, 309 people were poisoned and causing suffocation. And now as the economy continues to develop, the use of polyurethane foam is greatly increased, the flame retardant flexible polyurethane foam more and more pressing demands. Fire-retardant treated polyurethane foam decomposition of the change in rows, the mechanism of decomposition of any changes, the current system of no coverage. In this paper, thermal analysis techniques, a wide range of flame retardants on the thermal decomposition of polyurethane foam were studied.
2.2 Instrument: TGA/SDTA851e type thermal analyzer, Company production.
2.3 Experimental Method: The flexible polyurethane foam cut to 50mm length and breadth are the shape, according to the ratio of the flame retardant 40% were dissolved in distilled water, the flexible polyurethane foam into the solution, squeeze to soak for about 10min, squeezed out excess solution, placed in oven at 100 under dry conditions. The polyurethane foam blank sample cut Unqualified, electronic scales weigh about 5mg crucible into the standard, adjusting the initial temperature of thermal analysis increased from 50 to 700 , heating rate 10 / min, in nitrogen ( 30ml/min) under an atmosphere of experimental analysis.
2.4 Data Processing 3 Results and Analysis The various samples were analyzed by 2.3 tests, the results shown in Figure 1-10.
Figure 1. Without the flame retardant FPUF the TG-DTG curves of Figure 2. Hexametaphosphate flame-retardant polyurethane foam TG-DTG curve
9. Ammonium phosphate fire retardant polyurethane foam TG-DTG curves of Figure 10. Polyphosphate flame-retardant polyurethane foam TG-DTG curve
From the thermal analysis results (Figure 1-10) can be seen at 235.37 flexible polyurethane foam has already begun, under the decomposition, the decomposition process can be divided into 230 ~ 350 , 350 ~ 410 2 weight loss important change in temperature occurred in the initial decomposition (230 ~ 350 ), the decomposition rate of slow weight loss at this stage about 25%.
