Fabrication of cellulose-based halogen-free flame retardant and its synergistic effect with expandable graphite in polypropylene

Zaihang Zheng; Yuhang Liu; Boya Dai; Chunyu Meng; Zhenxue Guo

doi:10.1016/j.carbpol.2019.02.088

Fabrication of cellulose-based halogen-free flame retardant and its synergistic effect with expandable graphite in polypropylene

Carbohydr Polym. 2019 Jun 1:213:257-265. doi: 10.1016/j.carbpol.2019.02.088. Epub 2019 Feb 26.

Authors

Zaihang Zheng¹, Yuhang Liu², Boya Dai², Chunyu Meng², Zhenxue Guo²

Affiliations

¹ School of Chemical Engineering, Changchun University of Technology, Changchun 130012, PR China; Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, PR China. Electronic address: zhengzaihang@ccut.edu.cn.
² School of Chemical Engineering, Changchun University of Technology, Changchun 130012, PR China.

PMID: 30879667
DOI: 10.1016/j.carbpol.2019.02.088

Abstract

In this paper, a mono-component, cellulose-based and intumescent halogen-free flame retardant (HECPM) was prepared by introducing phosphate groups and melamine groups onto the structure of cellulose. And the chemical structure and surface morphology of HECPM was confirmed by FTIR, EDS and SEM, respectively. The thermal degradation tests demonstrate HECPM possesses great expansion property during the inducement of heat and the char residue of HECPM is higher than 43% at 600 °C. Moreover, the synergistic effect of HECPM and EG in flame-retarding polypropylene (PP) was also verified. When 30% HECPM/EG in ratio of 1/3 were introduced into PP, the LOI value reaches 31.5% and it can obtain UL-94 V-0 rating. The conjunct action of HECPM and EG in promoting the char-forming process was also achieved in comparison with the calculated and experimental TGA curves. Along with the investigation on the residue, a potential condensed-phase flame retardant mechanism was primarily proposed.

Keywords: Cellulose; Intumescent flame retardant; Mono-component; Polypropylene; Synergistic effect.