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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

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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