Bio-Based Hydroxypropyl Methylcellulose Reinforced Water Glass/Silica Sol Hybrid Gel Foam with Synergistic Flame-Retardant and Enhanced Fireproof Performance Under Laboratory Screening Conditions for Forest Fire Barriers.
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| Title: | Bio-Based Hydroxypropyl Methylcellulose Reinforced Water Glass/Silica Sol Hybrid Gel Foam with Synergistic Flame-Retardant and Enhanced Fireproof Performance Under Laboratory Screening Conditions for Forest Fire Barriers. |
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| Authors: | Wang, Pengfei1 (AUTHOR) crx41927294@163.com, Bai, Zhiming2 (AUTHOR) wangpengfei@tfri.com.cn, Cong, Ruoxin2,3 (AUTHOR), Yang, Hongyu1,3 (AUTHOR) yhongyu@cqu.edu.cn |
| Source: | Materials (1996-1944). Jun2026, Vol. 19 Issue 12, p2434. 23p. |
| Subjects: | Forest fire prevention & control, Fireproofing agents, Thermal stability, Foam, Silica, Soluble glass, Cellulose |
| Abstract: | Highlights: A composite of water glass/HPMC/silica sol (SGF-HPMC-SOL) was constructed. A stable organic–inorganic hybrid network enhances the material's properties. Its flame-retardant performance is superior to that of traditional gels. To meet the requirements of forest fire prevention, a water glass-based composite gel foam was developed by introducing hydroxypropyl methylcellulose (HPMC) and nanosilica sol into a sodium silicate/sodium bicarbonate matrix. The resulting water glass/HPMC/silica sol ternary system (SGF-HPMC-SOL) was designed to improve water retention, foam stability, substrate adhesion, and fire-barrier durability. The results indicate that HPMC and silica sol contributed to network reinforcement through hydrogen bonding, polymer-chain entanglement, nanoscale filling, and possible interfacial condensation. The optimized SGF-HPMC-SOL retained 20.4% of its initial mass after heating at 100 °C for 5 h, compared with 4.65% for SGF and 9.54% for SGF-HPMC; reached a carbonization time of 164 s under direct-flame exposure, versus 100 s for SGF and 137 s for SGF-HPMC; and maintained a residual mass of 76% at 800 °C in TGA, compared with 58.3% for SGF and 55.1% for SGF-HPMC. These improvements were associated with the formation of a denser silica-rich protective layer after combustion, which delayed heat transfer to the wood substrate. Under the adopted direct-flame screening conditions, SGF-HPMC-SOL exhibited enhanced flame-retardant performance compared with the reference gel foams, indicating its potential for enhanced flame-retardant performance under laboratory screening conditions for forest fire prevention. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Highlights: A composite of water glass/HPMC/silica sol (SGF-HPMC-SOL) was constructed. A stable organic–inorganic hybrid network enhances the material's properties. Its flame-retardant performance is superior to that of traditional gels. To meet the requirements of forest fire prevention, a water glass-based composite gel foam was developed by introducing hydroxypropyl methylcellulose (HPMC) and nanosilica sol into a sodium silicate/sodium bicarbonate matrix. The resulting water glass/HPMC/silica sol ternary system (SGF-HPMC-SOL) was designed to improve water retention, foam stability, substrate adhesion, and fire-barrier durability. The results indicate that HPMC and silica sol contributed to network reinforcement through hydrogen bonding, polymer-chain entanglement, nanoscale filling, and possible interfacial condensation. The optimized SGF-HPMC-SOL retained 20.4% of its initial mass after heating at 100 °C for 5 h, compared with 4.65% for SGF and 9.54% for SGF-HPMC; reached a carbonization time of 164 s under direct-flame exposure, versus 100 s for SGF and 137 s for SGF-HPMC; and maintained a residual mass of 76% at 800 °C in TGA, compared with 58.3% for SGF and 55.1% for SGF-HPMC. These improvements were associated with the formation of a denser silica-rich protective layer after combustion, which delayed heat transfer to the wood substrate. Under the adopted direct-flame screening conditions, SGF-HPMC-SOL exhibited enhanced flame-retardant performance compared with the reference gel foams, indicating its potential for enhanced flame-retardant performance under laboratory screening conditions for forest fire prevention. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19961944 |
| DOI: | 10.3390/ma19122434 |
