Citation: ZHU Deqin, SHENG Yu, ZHENG Shouyang, TONG Qingsong. Effect of the Melamine Polyphosphate/Pentaerythritol Ratio, Synergist Group and Surface Modification on Intumescent Flame Retardants of Polypropylene-Based Wood-Plastic Composites[J]. Chinese Journal of Applied Chemistry, ;2019, 36(6): 649-657. doi: 10.11944/j.issn.1000-0518.2019.06.180339 shu

Effect of the Melamine Polyphosphate/Pentaerythritol Ratio, Synergist Group and Surface Modification on Intumescent Flame Retardants of Polypropylene-Based Wood-Plastic Composites

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

Corresponding author: SHENG Yu, dr.shengyu@163.com
Received Date: 26 October 2018
Revised Date: 17 December 2018
Accepted Date: 24 January 2019

Fund Project: the Project in Industry-University Cooperation of Fujian Provincial Department of Science and Technology of China 2018Y4001Major Science and Technology Project in Industry-University Cooperation of Fujian Provincial Department of Science and Technology of China 2015Y4003Supported by the Project in Industry-University Cooperation of Fujian Provincial Department of Science and Technology of China(No.2018Y4001), Major Science and Technology Project in Industry-University Cooperation of Fujian Provincial Department of Science and Technology of China(No.2015Y4003)

Figures(6)

The effect of the mass ratio and composition of melamine polyphosphate(MPP)/pentaerythritol(PER) in intumescent flame retardants(IFRs), synergist group MgO/EG/SiO₂ of which composition with m(MgO):m(expandable graphite, EG):m(SiO₂)=1:5:5, and the silane coupling agent KH550 on the flame retardancy of polypropylene-based wood-plastic composites(WPC) were studied by means of limiting oxygen index(LOI), linear burning rate(LBR), thermogravimetric analysis and cone calorimetry. The results show that when m(MPP):m(PER)=23:2 in IFRs(code IFRs-M1) and its mass fraction is 25%, the flame retardant performance is the best, and LOI and LBR of the intumescent flame retardant composite WPC/IFRs-M1 are 27.1% and 3.89 mm/min, respectively, which are 48.1% higher and 89.79% lower than those of the unadded WPC. Compared with the unadded WPC, the heat release rate and total heat release during combustion decrease by 76.2% and 50.1%, the carbon residue rate at 600℃ increases by 498.3%, the total smoke emission reduces by 6.9%, and the release of CO₂ drops by 65.4%. It also indicates that both the synergist group and KH550 surface treatment can further improve the flame retardant properties of WPC/IFRs-M1, and both have good flame retardant synergistic effect on IFRs-M1. Compared with WPC/IFRs-M1, LOI of WPC/IFRs-M1/MgO/EG/SiO₂/KH550 with both flame retardant means mentioned above is enhanced by 3.7%, and its LBR declines by 20.3%. At the same time, its thermal stability significantly improves, the thermal weight loss goes down, and its heat release rate and total heat release during combustion reduce by 36.5% and 37.6%, respectively. Its carbon residue rate at 600℃ increases by 84.02%, the total smoke release reduces by 57.5%, and the amount of CO₂ release reduces by 33.33%, indicating a better synergistic effect.
- melamine polyphosphate,
- pentaerythritol,
- synergist group,
- wood plastic composite,
- flame retardant
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