Open Access

ARTICLE

Preparation and Properties of Bio-Based Flame Retardant Polyvinyl Alcohol

by You Shu^1,2, Qionglin Luo², Hongwei Lin^2,*, Yuejun Ouyang², Xiaomin Zhang^1,2, Liping Sheng¹, Shengpei Su^1,2,*

1 Country National and Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources, Hunan Normal University, Changsha, 410081, China
2 Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol Fiber Material, Huaihua University, Huaihua, 418000, China

* Corresponding Authors: Hongwei Lin. Email: ; Shengpei Su. Email:

(This article belongs to the Special Issue: Food Packaging Materials Based on Renewable Resources)

Journal of Renewable Materials 2021, 9(5), 909-921. https://doi.org/10.32604/jrm.2021.014216

Received 10 September 2020; Accepted 19 October 2020; Issue published 20 February 2021

Abstract

Polyvinyl alcohol (PVA) has been widely used in the fields of medical, food and packaging due to its excellent biocompatibility, good fiber-forming and film-forming properties. However, the high flammability of PVA has greatly limited its wider applications. The flame-retardant PVA was prepared by melt blending of a bio-based flame retardant (prepared from lignin, phosphoric acid and carbamide) with thermoplastic PVA (TPVA). The chemical structure, morphology, thermal properties, mechanical properties, fire property and fluidity of this flame retardant PVA were investigated by Fourier transform infrared spectrometer(FTIR), field emission scanning electron microscope(SEM), thermogravimetric analyzer(TGA), impact tester, universal testing machine, horizontal-vertical burning tester, limiting oxygen indexer(LOI) and melt flow rate meter(MFR). The results showed that the prepared flame retardant had good compatibility with the PVA substrate; The impact strength, melt flow rate, fire property and char residue of this PVA material increased with the content of bio-based flame retardant. When the content of flame retardant was of 20%, the five indices including impact strength, melt flow rate, UL-94 level, LOI and char residual were 11.3 KJ/m², 21.2 g/10 min, V-0 UL-94 level, 33.1%, and 19.2%, respectively. This research can promote the high-value utilization of lignin and the application of PVA in the fields of fire protection.

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