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Research on the combustion characteristics of high density fiberboard treated with MPP and AP(PDF)

Journal of Forestry Engineering[ISSN:2096-1359/CN:32-1862/S]

Issue:
2020 No.06
Page:
29-35
Research Field:
木材科学与技术 执行主编:吴义强 梅长彤
Publishing date:
2020-11-01

Info

Title:
Research on the combustion characteristics of high density fiberboard treated with MPP and AP
Author(s):
TANG Qiheng1 LU Xizhen2 GUO Wenjing1 FANG Lu2*
1. Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing 100091, China; 2. College of Furniture and Industrial Design, Nanjing Forestry University, Nanjing 210037, China
Keywords:
high density fiberboards melamine pyrophosphate aluminum hypophosphite synergistic effect combustion characteristics
PACS:
S781.9;TQ325
DOI:
10.13360/j.issn.2096-1359.201912022
Abstract:
Fiberboard has been well developed because of its good performance,but the inflammability still limits its wide applications. In order to improve the flameretardancy performance of fiberboard, melamine polyphosphate (MPP) and aluminum hypophosphite (AP) were used as flame retardants to prepare highdensity fiberboard (HDF) by the hotpressing process that was commonly used in the woodbased panel industry. The effects of flame retardants on the ignition time, heat release performance, mass change, smoke release performance, and smoke toxicity in the combustion process of HDF were examined using the cone calorimeter. The optimum mass ratio of MPP to AP in the binary system composed of two kinds of flame retardants was explored. The flameretardant mechanism was further analyzed based on the morphology of the carbon layer after the combustion of HDF. The results showed that both MPP and AP played a great role in improving the flame retardancy of HDF. MPP and AP decomposed into phosphoric acid and formed a large amount of residual carbon during combustion. The carbon layer can effectively isolate the oxygen and heat from the interior of the material, reduce the heat transfer rate, and hinder the continuous spread of flame, which significantly improved the flameretardant performance of HDF. In addition, MPP can effectively improve the ignition time of HDF, reduce the peak heat release rate, and had good smoke suppression ability. When the MPP and AP content reached 7.9%, it had a good flameretardant effect on HDF. Compared with the single flame retardant, the combination of MPP and AP exhibited synergistic effect and better flame retardancy, and the flameretardant effect of HDF was more significant. HDF without flame retardant was completely burned after the ignition, leaving only a small amount of ash. When MPP and AP at a constant mass ratio of 1∶2 were added into the HDF, the panels showed the most significant flameretardant efficiency. When the mass ratio of MPP and AP was 1∶2, the HDF had the best flameretardant performance. Compared to the control sample, the ignition time of HDF increased from 70 s to 73 s because of the addition of MPP/AP, indicating that MPP and AP had a good ability to prohibit the combustion of HDF. In addition, the peak heat release rate and the total heat release value of HDF decreased from 392.3 kW/m2 and 55.1 MJ/m2 to 319.7 kW/m2 and 47.7 MJ/m2, respectively, after the addition of flameretardant, indicating that the fire density decreased. Furthermore, the residual char increased from 22.1% to 29.5%.

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Last Update: 2020-11-11