Preparation of LDHs Based on Bittern and Its Flame Retardant Properties in EVA/LDHs Composites

Bittern, as a byproduct of salt manufacture, is abundant in China. The researches and developments for seawater bittern have mainly focused on the reuse of magnesium, calcium, lithium, and boron. However, the utilization rate is less than 20%. The large amount of unused bittern has become a challeng...

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Main Authors: Long Li, Yi Qian, Peng Qiao, Haoyue Han, Haiming Zhang
Format: Article
Language:English
Published: Hindawi-Wiley 2019-01-01
Series:Advances in Polymer Technology
Online Access:http://dx.doi.org/10.1155/2019/4682164
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spelling doaj-16fcf587bffb4b78873bf551b4f6f46b2020-11-24T22:43:58ZengHindawi-WileyAdvances in Polymer Technology0730-66791098-23292019-01-01201910.1155/2019/46821644682164Preparation of LDHs Based on Bittern and Its Flame Retardant Properties in EVA/LDHs CompositesLong Li0Yi Qian1Peng Qiao2Haoyue Han3Haiming Zhang4College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaCollege of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaCollege of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaCollege of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaCollege of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaBittern, as a byproduct of salt manufacture, is abundant in China. The researches and developments for seawater bittern have mainly focused on the reuse of magnesium, calcium, lithium, and boron. However, the utilization rate is less than 20%. The large amount of unused bittern has become a challenge that attracts much attention in academic and industry areas. In this paper, three kinds of layered double hydroxides (LDHs) were synthesized from bittern using a coprecipitation method and characterized by X-ray diffraction (XRD). The XRD results showed that the three kinds of LDHs(MgAl-LDHs, MgFe-LDHs and MgAlFe-LDHs) were successfully synthesized. Then, the flame retardant properties and thermal properties of the three LDHs in ethylene vinyl acetate (EVA)/LDHs composites had been tested by cone calorimeter test (CCT), limiting oxygen index (LOI), smoke density test (SDT), and thermogravimetry-Fourier transform infrared spectrometry (TG-IR). The CCT results showed that the heat release rate (HRR) of all three kinds of EVA/LDHs composites significantly decreased compared with that of pure EVA, and the EVA/MgAl-LDHs composites had the lowest PHRR value of 222.65 kW/m2. The LOI results showed that EVA/MgAl-LDHs composites had the highest LOI value of 29.8%. The SDT results indicated that MgAl-LDHs were beneficial to smoke suppression. TG-IR results showed that EVA/MgAl-LDHs composites had a better thermal stability.http://dx.doi.org/10.1155/2019/4682164
collection DOAJ
language English
format Article
sources DOAJ
author Long Li
Yi Qian
Peng Qiao
Haoyue Han
Haiming Zhang
spellingShingle Long Li
Yi Qian
Peng Qiao
Haoyue Han
Haiming Zhang
Preparation of LDHs Based on Bittern and Its Flame Retardant Properties in EVA/LDHs Composites
Advances in Polymer Technology
author_facet Long Li
Yi Qian
Peng Qiao
Haoyue Han
Haiming Zhang
author_sort Long Li
title Preparation of LDHs Based on Bittern and Its Flame Retardant Properties in EVA/LDHs Composites
title_short Preparation of LDHs Based on Bittern and Its Flame Retardant Properties in EVA/LDHs Composites
title_full Preparation of LDHs Based on Bittern and Its Flame Retardant Properties in EVA/LDHs Composites
title_fullStr Preparation of LDHs Based on Bittern and Its Flame Retardant Properties in EVA/LDHs Composites
title_full_unstemmed Preparation of LDHs Based on Bittern and Its Flame Retardant Properties in EVA/LDHs Composites
title_sort preparation of ldhs based on bittern and its flame retardant properties in eva/ldhs composites
publisher Hindawi-Wiley
series Advances in Polymer Technology
issn 0730-6679
1098-2329
publishDate 2019-01-01
description Bittern, as a byproduct of salt manufacture, is abundant in China. The researches and developments for seawater bittern have mainly focused on the reuse of magnesium, calcium, lithium, and boron. However, the utilization rate is less than 20%. The large amount of unused bittern has become a challenge that attracts much attention in academic and industry areas. In this paper, three kinds of layered double hydroxides (LDHs) were synthesized from bittern using a coprecipitation method and characterized by X-ray diffraction (XRD). The XRD results showed that the three kinds of LDHs(MgAl-LDHs, MgFe-LDHs and MgAlFe-LDHs) were successfully synthesized. Then, the flame retardant properties and thermal properties of the three LDHs in ethylene vinyl acetate (EVA)/LDHs composites had been tested by cone calorimeter test (CCT), limiting oxygen index (LOI), smoke density test (SDT), and thermogravimetry-Fourier transform infrared spectrometry (TG-IR). The CCT results showed that the heat release rate (HRR) of all three kinds of EVA/LDHs composites significantly decreased compared with that of pure EVA, and the EVA/MgAl-LDHs composites had the lowest PHRR value of 222.65 kW/m2. The LOI results showed that EVA/MgAl-LDHs composites had the highest LOI value of 29.8%. The SDT results indicated that MgAl-LDHs were beneficial to smoke suppression. TG-IR results showed that EVA/MgAl-LDHs composites had a better thermal stability.
url http://dx.doi.org/10.1155/2019/4682164
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