A novel organic-inorganic hybrid K-HBPE@APP performing excellent flame retardancy and smoke suppression for polypropylene

Naien Zhang; Jie Zhang; Hong Yan; Xiaorong Guo; Qiang Sun; Ruijie Guo

doi:10.1016/j.jhazmat.2019.04.016

A novel organic-inorganic hybrid K-HBPE@APP performing excellent flame retardancy and smoke suppression for polypropylene

J Hazard Mater. 2019 Jul 5:373:856-865. doi: 10.1016/j.jhazmat.2019.04.016. Epub 2019 Apr 4.

Authors

Naien Zhang¹, Jie Zhang¹, Hong Yan², Xiaorong Guo¹, Qiang Sun¹, Ruijie Guo¹

Affiliations

¹ Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024, PR China; College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China.
² Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024, PR China; College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China. Electronic address: yanhong@tyut.edu.cn.

PMID: 31009907
DOI: 10.1016/j.jhazmat.2019.04.016

Abstract

To overcome the flammability and severe dripping of polypropylene (PP), a novel organic-inorganic hybrid K-HBPE@APP (microencapsulated APP by a hyperbranched polyester (HBPE) via silane coupling agent (KH-550)) was obtained and used as a high-efficient flame retardant and smoke suppressant. Herein, HBPE acted as the charring agent for APP. 20 wt% of K-HBPE@APP imparted PP excellent flame retardancy, V-0 rating (UL-94 test) and 82.6% decrease in the peak of heat release rate (PHRR). However, PP with 25 wt% of mechanically mixed APP and HBPE achieved V-1 rating (UL-94 test) and 77.3% decrease in PHRR. That is because the direct contact and sufficient interaction between APP and HBPE gives full play to their synergy. Besides, K-HBPE@APP accelerated the formation of cross-linked POC/SiOSi/SiOC/SiOP/POΦ structures, leading to a strong and compact char layer with a result of dramatic reduction in heat release rate and smoke production. Furthermore, K-HBPE@APP was highly water-resistant and has good compatibility with PP matrix. In particular, the flame-retarded PP had similar tensile strength to pure PP and enhanced impact strength.

Keywords: Flame retardant; Hyperbranched polyester; Organic-inorganic hybrid; Polypropylene.