An Effective Expanded Graphite Coating on Polystyrene Bead for Improving Flame Retardancy
Although foamed plastic insulation is widely used in construction in the Korean market, it is vulnerable to fire. To improve the flame retardancy, the method of flame-retardant coating with the EG in water-soluble state on the surface of expanded polystyrene (EPS) beads has been widely used. However...
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MDPI AG
2021
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oai:doaj.org-article:366888f6145348b0bd4e35d70854a4522021-11-11T18:13:09ZAn Effective Expanded Graphite Coating on Polystyrene Bead for Improving Flame Retardancy10.3390/ma142167291996-1944https://doaj.org/article/366888f6145348b0bd4e35d70854a4522021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6729https://doaj.org/toc/1996-1944Although foamed plastic insulation is widely used in construction in the Korean market, it is vulnerable to fire. To improve the flame retardancy, the method of flame-retardant coating with the EG in water-soluble state on the surface of expanded polystyrene (EPS) beads has been widely used. However, polystyrene beads coated with a water-soluble flame retardant easily separate the coated flame retardant in manufacturing. In this study is devised a flame-retardant coating and two steps of coating process for adhering the flame-retardant coating film evenly to the surface of the polystyrene bead without exfoliation. It was analyzed whether a flame-retardant EPS (FR-EPS) with excellent flame retardancy could be manufactured using polystyrene beads coated in this way. Ten FR-EPS samples satisfied the HF-1 and V-0 levels in horizontal and vertical burning tests, respectively. The THR of eight FR-EPS samples for ten minutes did not exceed 8 MJ∙m<sup>−2</sup> and the maximum HRR did not exceed 200 kW∙m<sup>−2</sup> for more than ten consecutive seconds. FR-EPS passed the building material standard of semi-nonflammability in Korean regulations, in contrast to commercial EPS, which have not passed the semi-nonflammability standard. It was also analyzed how effective the designed coating is in this study, comparing it with composites that were planned to improve the flame resistance of polystyrene, as reported in the literature. Flame Retardancy Index (FRI) values of FR-EPS proved the “excellent” level and had higher values compared with other polystyrene composites. These results demonstrated that the coated EPS containing a water-soluble flame retardant manufactured from EG and two steps of application with the coating solution achieved fire safety standard regulations.Minjung BaeHyunhwa LeeGyeongseok ChoiJaesik KangMDPI AGarticlefire safety standardsexpanded polystyreneexpanded graphitesemi-nonflammableTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6729, p 6729 (2021) |
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DOAJ |
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fire safety standards expanded polystyrene expanded graphite semi-nonflammable Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
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fire safety standards expanded polystyrene expanded graphite semi-nonflammable Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Minjung Bae Hyunhwa Lee Gyeongseok Choi Jaesik Kang An Effective Expanded Graphite Coating on Polystyrene Bead for Improving Flame Retardancy |
description |
Although foamed plastic insulation is widely used in construction in the Korean market, it is vulnerable to fire. To improve the flame retardancy, the method of flame-retardant coating with the EG in water-soluble state on the surface of expanded polystyrene (EPS) beads has been widely used. However, polystyrene beads coated with a water-soluble flame retardant easily separate the coated flame retardant in manufacturing. In this study is devised a flame-retardant coating and two steps of coating process for adhering the flame-retardant coating film evenly to the surface of the polystyrene bead without exfoliation. It was analyzed whether a flame-retardant EPS (FR-EPS) with excellent flame retardancy could be manufactured using polystyrene beads coated in this way. Ten FR-EPS samples satisfied the HF-1 and V-0 levels in horizontal and vertical burning tests, respectively. The THR of eight FR-EPS samples for ten minutes did not exceed 8 MJ∙m<sup>−2</sup> and the maximum HRR did not exceed 200 kW∙m<sup>−2</sup> for more than ten consecutive seconds. FR-EPS passed the building material standard of semi-nonflammability in Korean regulations, in contrast to commercial EPS, which have not passed the semi-nonflammability standard. It was also analyzed how effective the designed coating is in this study, comparing it with composites that were planned to improve the flame resistance of polystyrene, as reported in the literature. Flame Retardancy Index (FRI) values of FR-EPS proved the “excellent” level and had higher values compared with other polystyrene composites. These results demonstrated that the coated EPS containing a water-soluble flame retardant manufactured from EG and two steps of application with the coating solution achieved fire safety standard regulations. |
format |
article |
author |
Minjung Bae Hyunhwa Lee Gyeongseok Choi Jaesik Kang |
author_facet |
Minjung Bae Hyunhwa Lee Gyeongseok Choi Jaesik Kang |
author_sort |
Minjung Bae |
title |
An Effective Expanded Graphite Coating on Polystyrene Bead for Improving Flame Retardancy |
title_short |
An Effective Expanded Graphite Coating on Polystyrene Bead for Improving Flame Retardancy |
title_full |
An Effective Expanded Graphite Coating on Polystyrene Bead for Improving Flame Retardancy |
title_fullStr |
An Effective Expanded Graphite Coating on Polystyrene Bead for Improving Flame Retardancy |
title_full_unstemmed |
An Effective Expanded Graphite Coating on Polystyrene Bead for Improving Flame Retardancy |
title_sort |
effective expanded graphite coating on polystyrene bead for improving flame retardancy |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doaj.org/article/366888f6145348b0bd4e35d70854a452 |
work_keys_str_mv |
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