Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene

doi:10.1016/j.cjche.2020.03.034

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (6): 1725-1732.DOI: 10.1016/j.cjche.2020.03.034

• Materials and Product Engineering • Previous Articles Next Articles

Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene

Yuan Xue, Rongjing Zhao, Ling Zhang, Chunzhong Li

Shanghai Engineering Research Center of Hierarchical Nanomaterials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China

Received:2020-01-16 Revised:2020-03-24 Online:2020-07-29 Published:2020-06-28
Contact: Ling Zhang, Chunzhong Li
Supported by:
This work was supported by the National Natural Science Foundation of China(21878092, 21838003, 91834301), the Shanghai Scientific and Technological Innovation Project(18JC1410500, 19JC1410400), the Innovation Program of Shanghai Municipal Education Commission, the Fundamental Research Funds for the Central Universities(222201718002).

Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene

Yuan Xue, Rongjing Zhao, Ling Zhang, Chunzhong Li

Shanghai Engineering Research Center of Hierarchical Nanomaterials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China

通讯作者: Ling Zhang, Chunzhong Li
基金资助:
This work was supported by the National Natural Science Foundation of China(21878092, 21838003, 91834301), the Shanghai Scientific and Technological Innovation Project(18JC1410500, 19JC1410400), the Innovation Program of Shanghai Municipal Education Commission, the Fundamental Research Funds for the Central Universities(222201718002).

Abstract

Abstract: Glass fiber reinforced polypropylene (GF-PP) composites have high flammability on account of wick effect which leads to accelerated flow of the polymer melt along the glass fibers (GF) surface to the flame zone. In this study, dipentaerythritol (DPER), a charring agent, was adsorbed on the GF surface through the hydrogen bond between silane coupling agent and DPER. DPER has a synergistic effect with the intumescent flame retardants (IFR) added in the composites, which can induce interfacial carbonization on the surface of GF, thus transforming the intrinsic smooth GF surface into roughness one. In this way, the negative effect of the wick effect in flame retardancy is weakened. Moreover, the char residues remained on the surface of GF can bring an improved adhesion between GF and char residues formed in the resin so that a more stable barrier char layer is formed. The PP composites with 20 wt% modified glass fiber (M-GF) and 30 wt% IFR can achieve the UL-94V-0, and its limiting oxygen index (LOI) value increased from 16.5% to 29.5%. Simultaneously, the heat release rate (HRR), total heat release (THR) and total smoke release (TSR) decreased significantly, and the peak of heat release rate (PHRR) reduced 60.6% compared with GF-PP.

Key words: Glass fiber, Wick effect, Flame retardant, Interfacial, Char layers

摘要： Glass fiber reinforced polypropylene (GF-PP) composites have high flammability on account of wick effect which leads to accelerated flow of the polymer melt along the glass fibers (GF) surface to the flame zone. In this study, dipentaerythritol (DPER), a charring agent, was adsorbed on the GF surface through the hydrogen bond between silane coupling agent and DPER. DPER has a synergistic effect with the intumescent flame retardants (IFR) added in the composites, which can induce interfacial carbonization on the surface of GF, thus transforming the intrinsic smooth GF surface into roughness one. In this way, the negative effect of the wick effect in flame retardancy is weakened. Moreover, the char residues remained on the surface of GF can bring an improved adhesion between GF and char residues formed in the resin so that a more stable barrier char layer is formed. The PP composites with 20 wt% modified glass fiber (M-GF) and 30 wt% IFR can achieve the UL-94V-0, and its limiting oxygen index (LOI) value increased from 16.5% to 29.5%. Simultaneously, the heat release rate (HRR), total heat release (THR) and total smoke release (TSR) decreased significantly, and the peak of heat release rate (PHRR) reduced 60.6% compared with GF-PP.

关键词: Glass fiber, Wick effect, Flame retardant, Interfacial, Char layers

Yuan Xue, Rongjing Zhao, Ling Zhang, Chunzhong Li. Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene[J]. Chinese Journal of Chemical Engineering, 2020, 28(6): 1725-1732.

Yuan Xue, Rongjing Zhao, Ling Zhang, Chunzhong Li. Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene[J]. 中国化学工程学报, 2020, 28(6): 1725-1732.

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Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene

Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene

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