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以菱镁矿制备氢氧化镁阻燃剂并提高EVA的阻燃性能

Preparation of Magnesium Hydroxide Flame Retardant from Hydromagnesite and Enhance the Flame Retardant Performance of EVA.

作者信息

Jiao Ling-Li, Zhao Peng-Cheng, Liu Zhi-Qi, Wu Qing-Shan, Yan Dong-Qiang, Li Yi-Lan, Chen Yu-Nan, Li Ji-Sheng

机构信息

School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China.

Green Industry Innovation Research Institute, Anhui University, Hefei 230039, China.

出版信息

Polymers (Basel). 2022 Apr 12;14(8):1567. doi: 10.3390/polym14081567.

DOI:10.3390/polym14081567
PMID:35458317
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9030901/
Abstract

In this study, hydromagnesite, a rare natural hydrated alkaline magnesium carbonate, was used to synthesize magnesium hydroxide (MH) as a flame retardant for ethylene-vinyl acetate (EVA) to enhance its fire resistance and smoke suppression. Various concentrations of sodium hydroxide (NaOH) were used to alter the morphology and the flame-retardant efficiency of synthesized MH. EVA/MH composites were prepared through melt blending, and the influence of NaOH on the flame retardancy and mechanical properties was investigated by means of the limiting oxygen index (LOI), cone calorimeter test (CCT) and tensile test. The flame retardancy results demonstrated that composites exhibited remarkably improved flame retardant properties after introducing MH, reflected by an increase in the LOI value from 20% for neat EVA to roughly 38%. Additionally, the peak of heat release rate (pHRR), the total heat release (THR) and the peak of the smoke production rate for EVA3 were decreased by 37.6%, 20.7% and 44.4% compared with neat EVA, respectively. In the meantime, increasing char residues were also observed. The incorporation of different MH concentrations had a limited effect on the mechanical properties of the EVA/MH composites.

摘要

在本研究中，水菱镁矿（一种罕见的天然水合碱式碳酸镁）被用于合成氢氧化镁（MH），作为乙烯 - 醋酸乙烯酯（EVA）的阻燃剂，以提高其耐火性和抑烟性。使用不同浓度的氢氧化钠（NaOH）来改变合成的MH的形态和阻燃效率。通过熔融共混制备了EVA/MH复合材料，并通过极限氧指数（LOI）、锥形量热仪测试（CCT）和拉伸试验研究了NaOH对阻燃性和力学性能的影响。阻燃结果表明，引入MH后复合材料的阻燃性能显著提高，表现为LOI值从纯EVA的20%增加到约38%。此外，与纯EVA相比，EVA3的热释放速率峰值（pHRR）、总热释放量（THR）和产烟速率峰值分别降低了37.6%、20.7%和44.4%。同时，还观察到残炭量增加。不同MH浓度的加入对EVA/MH复合材料的力学性能影响有限。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3e9c/9030901/623799270b35/polymers-14-01567-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3e9c/9030901/e811c2546a16/polymers-14-01567-g004.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3e9c/9030901/13ef6858f47b/polymers-14-01567-g006.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3e9c/9030901/aefdff7d8333/polymers-14-01567-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3e9c/9030901/ad7d421df83f/polymers-14-01567-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3e9c/9030901/1712b3c97022/polymers-14-01567-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3e9c/9030901/eddca6335934/polymers-14-01567-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3e9c/9030901/623799270b35/polymers-14-01567-g014.jpg

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