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Chemistry and Industry of Forest Products ›› 2019, Vol. 39 ›› Issue (3): 87-93.doi: 10.3969/j.issn.0253-2417.2019.03.012

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Effect of Hybrid Flame Retardant on Properties of Formaldehyde-free Ultra-low Density Fiberboard

Manjun ZHAN,Zhilin CHEN,Fuxiang CHU*()   

  1. Chinese Academy of Forestry, Beijing 100091, China
  • Received:2019-01-30 Online:2019-06-28 Published:2019-06-26
  • Contact: Fuxiang CHU E-mail:chufuxiang@caf.ac.cn
  • Supported by:
    广西创新驱动发展专项资金项目(桂科AA17204065-18)

Abstract:

Formaldehyde-free ultra-low density fiberboards(NUDF) were prepared by P-N-B hybrid flame retardants and isocyanate(PMDI) adhesive. The effects of P-N-B flame retardant addition on the physicochemical properties, formaldehyde emission, and flame retardant performance of NUDF were investigated. The results showed that the physico-mechanical property and formaldehyde emission of NUDF gradually declined with the increase of P-N-B flame retardants amount(0-8%). However, the flammability of NUDF significantly decreased, the oxygen index increased, total heat release decreased, and carbonization phenomenon of UNDF was obvious. The NUDF displayed optimized performance as the flame retardant addition reached 6%. Specifically, the internal bonding strength(IB), modulus of rupture(MOR), the thickness expansion rate of water absorption for 24 h(24 h TS), formaldehyde release and combustion length was 0.41 MPa, 14.5 MPa, 8.1%, 2.0 μg/g and 80 mm, respectively. The oxygen index was 32.5% and total heat release of 600 s was 12 MJ/m2. The flame retardant and smoke production performance of NUDF met the B1-C and S1 grade of GB 8624-2012 standard, respectively. The NUDF had excellent mechanical properties, environmentally friendly performance, and good flame retardant properties. The results of cone calorimetry showed that with the increase of flame retardant addition, the total heat release of combustion process decreased, the total smoke production increased, the yield of CO increased and the yield of CO2 decreased.

Key words: flame retardant, ultra-low density fiberboard, total heat release

CLC Number: