Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood
Abstract
:1. Introduction
2. Materials and Methods
2.1. Preparation of NH4SCN-Modified Geopolymeric Coatings
2.1.1. Starting Materials
2.1.2. Preparation of NH4SCN-Modified Geopolymeric Coatings
2.1.3. Preparation of Samples
2.2. Characterizations
2.2.1. Flame Resistance
2.2.2. Microstructure Analysis
3. Results
3.1. Flame-Retardant Properties
3.2. Morphologies
3.2.1. Macro-Morphology of Samples
3.2.2. Micro-Morphology after Combustion
3.3. TG/DSC
3.4. XRD
4. Discussion
5. Conclusions
- A novel NH4SCN-modified geopolymeric coatings for flame-retarding plywood was prepared via a facile sol–gel method, and the optimal dosage of NH4SCN was determined as 1 wt.%, evidenced by the highest FPI, the lowest FGI, and the pHRR dropping to 248 kW·m−2 with a 39.7% decrease.
- Microstructure analysis determined that moderate use of NH4SCN as a dopant is of importance for a uniform and continuous coating before combustion, which is beneficial for the formation of a smooth and intact swollen siliceous shielding layer during combustion. The enhancement of flame resistance mainly depends on the formation of a compact and continuous siliceous layer.
Author Contributions
Funding
Conflicts of Interest
References
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Material | Weight (wt.%) | ||||||||
---|---|---|---|---|---|---|---|---|---|
CaO | SiO2 | Al2O3 | Fe2O3 | MgO | Na2O | K2O | SO3 | Loss | |
Fumed silica | 0.61 | 87.46 | 6.90 | 1.17 | 0.46 | 0.29 | 0.67 | 0.31 | 2.12 |
Samples | TTI (s) | Tb (s) | Tp (s) | pHRR (kW·m−2) | FPI (s·m2·kW−1) | FGI (kW·m−2·s−1) |
---|---|---|---|---|---|---|
Sr | 18 | 289 | 214 | 545 | 0.03 | 2.55 |
S0 | 58 | 298 | 219 | 411 | 0.14 | 1.88 |
S1 | 78 | 312 | 234 | 301 | 0.33 | 1.29 |
S2 | 102 | 356 | 238 | 248 | 0.41 | 1.04 |
S3 | 81 | 373 | 243 | 261 | 0.33 | 1.07 |
S4 | 59 | 342 | 252 | 343 | 0.17 | 1.36 |
S5 | 47 | 320 | 278 | 356 | 0.13 | 1.28 |
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Wang, Y.; Zhao, J. Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood. Coatings 2019, 9, 479. https://doi.org/10.3390/coatings9080479
Wang Y, Zhao J. Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood. Coatings. 2019; 9(8):479. https://doi.org/10.3390/coatings9080479
Chicago/Turabian StyleWang, Yachao, and Jiangping Zhao. 2019. "Ecological Ammonium Thiocyanate-Modified Geopolymeric Coating for Flame-Retarding Plywood" Coatings 9, no. 8: 479. https://doi.org/10.3390/coatings9080479