Abstract
This paper presents experimental research on the flame-retardant properties and thermal decomposition kinetics of wood treated by boric-acid-modified silica sol. The poplar wood was impregnated with pure silica sol and boric-acid-modified silica sol. The results showed that modifiers can be observed in the cell wall and cell lumen. The ignition time, second peak of the heat release rate, total heat release, and mass loss of the W-Si/B were delayed obviously. The composite silicon modification had a positive impact on carbonization. Thermogravimetric analysis showed that the residual mass of W-Si/B was enhanced and the thermal degradation rate was considerably decreased. By thermal decomposition kinetics analysis, the boric acid can catalyze the thermal degradation and carbonization of poplar wood. In other words, wood treated with boric-acid-modified silica sol showed significant improvement in terms of flame retardancy, compared with wood treated with common silica sol.
Highlights
Wood is a green environmental protection material, and a natural and renewable resource
Through the full-cell method, modifiers can fill in the vessel and fiber of poplar wood and can effectively enter and be fixed in the wood
The cone calorimeter analysis shows that the ignition time, second peak of heat release rate, total heat release and mass loss of the W-Si/B are obviously delayed
Summary
Wood is a green environmental protection material, and a natural and renewable resource. Plantation wood exhibits lower density and strength, so it is more prone to fire risk [2]. Wood modification is an effective strategy to improve the material properties and qualities of fast-growing plantation wood, and expand its applications. Conventional treatment methods such as acetylation [3], heat treatment [4], and impregnation treatment [5,6] can effectively improve the comprehensive performance of wood. Wood is a material with hierarchical porous structure, which allows for the penetration of modifiers and the formation of chemical cross-linking
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