Citation: ZHU Deqin, ZHENG Shouyang, SHENG Yu. Flame-retardant Synergistic Effect of Synergists on Intumescent Flame-retardant Wood Flour-Polypropylene Composites[J]. Chinese Journal of Applied Chemistry, ;2017, 34(2): 195-203. doi: 10.11944/j.issn.1000-0518.2017.02.160189 shu

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

Fujian Key Laboratory of Polymer Materials, College of Materials Science and Engineering of Fujian Normal University, Fuzhou 350007, China

Corresponding author: SHENG Yu, dr.shengyu@163.com
Received Date: 6 May 2016
Revised Date: 15 June 2016
Accepted Date: 13 June 2016

Fund Project: Major Science and Technology Project in Industry-University Cooperation of Fujian Provincial Department of Science and Technology of China 2012Y4002Project of the Natural Science Foundation of Fujian Province of China 2010J01276the Project in Industry-University Cooperation of Fujian Provincial Department of Science and Technology of China 2015Y4003

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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)/SiO₂ with a significant synergistic flame retardant effect on the IFRs was obtained. The composition of MgO/EG/SiO₂ is 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.
- orthogonal experiment,
- wood-plastics composite,
- intumescent flame retardants,
- synergist
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