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Synthesis and characterisation of the halogen-free flame retardant and mechanical performance of the retardant epoxies resin

Bing Liang (School of Material Science and Engineering, Shenyang University of Chemical Technology, Shenyang, China)
Jiao Lv (School of Material Science and Engineering, Shenyang University of Chemical Technology, Shenyang, China)
Gang Wang (School of Material Science and Engineering, Shenyang University of Chemical Technology, Shenyang, China)
Tsubaki Noritatsu (Department of Applied Chemistry, Faculty of Engineering, University of Toyama, Toyama, Japan)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 2 May 2017

195

Abstract

Purpose

The purpose of this paper is to prepare a novel halogen-free intumescent flame retardant (IFR) BHPPODC (benzene hydroquinone phosphorous oxy dichloride cyanuric chloride) for application to epoxy resin (EP) and study their mechanical and flame-retardant performance.

Design/methodology/approach

The IFR was synthesised by phenylphosphonic dichloride, hydroquinone and cyanuric chloride via solvent reaction, and the structure was fully characterised by proton nuclear magnetic resonance (1H-NMR), mass spectrometry (MS) and Fourier transform infrared (FT-IR) spectroscopy. The thermal stability, mechanical and flame properties and morphology of the char layer of the flame-retardant EP was investigated by using thermogravimetric analysis (TGA), tensile and Charpy impact tests, limiting oxygen index (LOI) and vertical burning test (UL-94) and scanning electron microscopy (SEM).

Findings

Results of the LOI indicated that the halogen-free flame retardant as an additive exhibits very good flame-retardant effects. The results showed that the addition of IFR improved the flame resistance properties of epoxies resin composites, and the residual char ratio at 800°C significantly increased.

Research limitations/implications

The IFR can be prepared successfully and can improve the flame-retardant performance.

Practical implications

This contribution can provide a high flame retardant performance and has minimal impact on the mechanical performance of the BHPPODC/EP composition.

Originality/value

This study showed that flame-retardant BHPPODC has an effective flame effect under optimal conditions. When the 12 Wt.% IFR was added to the EP, the LOI was 29.1 and the UL-94 rank can reach V-0 rank, the tensile strength was 83.86 MPa and the impact strength was 8.82 kJ/m2.

Keywords

Acknowledgements

This study received funding from the National Science-technology Support Plan, China (agreement code: 2012BAB06B03) and the International Technical Cooperation and Exchanges Specific-Funds-China (agreement code: 2013DFA51200).

Citation

Liang, B., Lv, J., Wang, G. and Noritatsu, T. (2017), "Synthesis and characterisation of the halogen-free flame retardant and mechanical performance of the retardant epoxies resin", Pigment & Resin Technology, Vol. 46 No. 3, pp. 172-180. https://doi.org/10.1108/PRT-02-2016-0021

Publisher

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Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited

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