Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (2): 195-203.DOI: 10.11944/j.issn.1000-0518.2017.02.160189

• Full Papers • Previous Articles     Next Articles

Flame-retardant Synergistic Effect of Synergists on Intumescent Flame-retardant Wood Flour-Polypropylene Composites

ZHU Deqin,ZHENG Shouyang,SHENG Yu()   

  1. Fujian Key Laboratory of Polymer Materials,College of Materials Science and Engineering of Fujian Normal University,Fuzhou 350007,China
  • Received:2016-05-06 Accepted:2016-07-13 Published:2017-01-18 Online:2017-01-18
  • Contact: SHENG Yu
  • Supported by:
    Supported by the Project in Industry-University Cooperation of Fujian Provincial Department of Science and Technology of China(No.2015Y4003), Major Science and Technology Project in Industry-University Cooperation of Fujian Provincial Department of Science and Technology of China(No.2012Y4002), Project of the Natural Science Foundation of Fujian Province of China(No.2010J01276)

Abstract:

Improving flame retardant properties of wood plastic composite material(WPC) has become one of the research hotspots of WPC in recent years. In this paper, the flame-retardant synergistic effects of eight kinds of synergists on intumescent flame retardants(IFRs, m(polyphosphate, APP):m(pentaerythritol, PER)=2:1) were studied by two rounds of orthogonal experiments. The synergist group MgO/EG(expandable graphite)/SiO2with a significant synergistic flame retardant effect on the IFRs was obtained. The composition of MgO/EG/SiO2is m(MgO):m(EG):m(SiO2)=1:5:5, optimum proportion of m(IFRs):m(MgO/EG/SiO2) is 1:0.18. The influence of IFRs and MgO/EG/SiO2 on thermal stability and flame-retardant properties of polypropylene based wood-plastics composite(WPC) was evaluated by thermogravimetric analysis(TGA) and cone calorimetry analysis(CONE). The results show that adding IFRs and MgO/EG/SiO2 to WPC can improve its thermal stability effectively, and the char residue of WPC/IFRs/MgO/EG/SiO2 at 600 ℃ reaches to 22.42%. The peak heat release rate(PHRR), the total heat release(THR) and total smoke production release(TSP) of WPC/IFRs reduce by 19.0%, 8.7% and 22.1%, respectively, compared with WPC. MgO/EG/SiO2 can further improve the flame retardant efficiency of IFRs, and the PHRR and THR of WPC/IFRs/MgO/EG/SiO2 drop by 33.0% and 13.8%, respectively, compared with WPC.

Key words: orthogonal experiment, wood-plastics composite, intumescent flame retardants, synergist