Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood
An ecological ammonium thiocyanate (NH<sub>4</sub>SCN)-modified geopolymeric coating was facilely prepared for flame-retarding plywood. The effect of NH<sub>4</sub>SCN on the flame resistance was preliminarily investigated using cone calorimeter (CC), scanning electron micros...
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Online Access: | https://www.mdpi.com/2079-6412/9/8/479 |
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doaj-cc0f50ef245f4644b43d517c9ce7dea92020-11-25T02:44:09ZengMDPI AGCoatings2079-64122019-07-019847910.3390/coatings9080479coatings9080479Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding PlywoodYachao Wang0Jiangping Zhao1School of Resource Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaSchool of Resource Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaAn ecological ammonium thiocyanate (NH<sub>4</sub>SCN)-modified geopolymeric coating was facilely prepared for flame-retarding plywood. The effect of NH<sub>4</sub>SCN on the flame resistance was preliminarily investigated using cone calorimeter (CC), scanning electron microscope (SEM), X-ray diffraction (XRD), and thermal gravimetry (TG). The results show that 1 wt.% NH<sub>4</sub>SCN as dopant is of paramount importance to generate a compact and continuous coating. The formation of a smooth, intact, and uniform-swelling siliceous layer during combustion facilitates enhanced fire resistance, evidenced by the increased fire performance index (FPI), reduced fire growth index (FGI), and 39.7% decreased value of peak heat release rate (pHRR), in comparison to those of the sample without NH<sub>4</sub>SCN. Because of the reducibility of O<sub>2</sub>-consuming NH<sub>4</sub>SCN, the compact shielding-layer containing carbonate and sulfate, as well as the release of NH<sub>3</sub>, the NH<sub>4</sub>SCN-modified geopolymeric coating exerts an enhancement on the flame-retardant efficiency.https://www.mdpi.com/2079-6412/9/8/479flame-retardancyammonium thiocyanatecone calorimeterthermogravimetry |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yachao Wang Jiangping Zhao |
spellingShingle |
Yachao Wang Jiangping Zhao Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood Coatings flame-retardancy ammonium thiocyanate cone calorimeter thermogravimetry |
author_facet |
Yachao Wang Jiangping Zhao |
author_sort |
Yachao Wang |
title |
Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood |
title_short |
Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood |
title_full |
Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood |
title_fullStr |
Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood |
title_full_unstemmed |
Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood |
title_sort |
ecological ammonium thiocyanate-modified geopolymeric coating for flame-retarding plywood |
publisher |
MDPI AG |
series |
Coatings |
issn |
2079-6412 |
publishDate |
2019-07-01 |
description |
An ecological ammonium thiocyanate (NH<sub>4</sub>SCN)-modified geopolymeric coating was facilely prepared for flame-retarding plywood. The effect of NH<sub>4</sub>SCN on the flame resistance was preliminarily investigated using cone calorimeter (CC), scanning electron microscope (SEM), X-ray diffraction (XRD), and thermal gravimetry (TG). The results show that 1 wt.% NH<sub>4</sub>SCN as dopant is of paramount importance to generate a compact and continuous coating. The formation of a smooth, intact, and uniform-swelling siliceous layer during combustion facilitates enhanced fire resistance, evidenced by the increased fire performance index (FPI), reduced fire growth index (FGI), and 39.7% decreased value of peak heat release rate (pHRR), in comparison to those of the sample without NH<sub>4</sub>SCN. Because of the reducibility of O<sub>2</sub>-consuming NH<sub>4</sub>SCN, the compact shielding-layer containing carbonate and sulfate, as well as the release of NH<sub>3</sub>, the NH<sub>4</sub>SCN-modified geopolymeric coating exerts an enhancement on the flame-retardant efficiency. |
topic |
flame-retardancy ammonium thiocyanate cone calorimeter thermogravimetry |
url |
https://www.mdpi.com/2079-6412/9/8/479 |
work_keys_str_mv |
AT yachaowang ecologicalammoniumthiocyanatemodifiedgeopolymericcoatingforflameretardingplywood AT jiangpingzhao ecologicalammoniumthiocyanatemodifiedgeopolymericcoatingforflameretardingplywood |
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1724767088602513408 |