WOOD RESEARCH Volume 67, Number 2, 2022
Caijuan Zhang, Hui Guo, Xinjie Zhou, LILI YU, HUI LI, and Zhi-Bin Yang

Effects of differrent boron-based flame retardants on the combustibility of bamboo filaments

In this study, eight types of boron-based flame retardants were performed to evaluate the effects of different boron components on the combustibility of the bamboo filaments. Disodium octaborate tetrahydrate, boric acid/borax, and nano-ZnBO4 were used as the active flame retardant components. Besides, other inorganic flame retardants including nano-SiO2 and ammonium polyphosphate (APP) were also introduced in order to increase the flame retardant of these boron-based components. The combustibility of the bamboo filaments treated with different flame retardants were evaluated by cone calorimeter analysis. The results showed that the flame retardants including the heat release and smoke release resistance of the bamboo filaments with different boron-based components and nano-SiO2 or APP, could be significantly improved, especially, in the samples treated with the compound flame retardant composed of boric acid, borax and nano-SiO2, which was attributed to the synergistic effect of these flame retardant components.

WOOD RESEARCH Volume 67, Number 2, 2022
Kang Zhou, LI LUO, and Bin Na

Study on flame retardant leach resistant of modified poplar wood

After flame retardant and enhancing treatment, fast-grown poplar face the problem of leaching of pharmacy, which affected the effective permanence of the retard and further use is limited. In this paper, we study the fixed effect of low molecule phenol-formaldehyde (PF) resin on nitrogen and phosphorus (N-P) inorganic flame retardant composite under the condition of high relative humidity. The change of lateral sizes and quality of the specimens were emphasized in the experiment. Results reveal that the greater the concentration of flame retardant was, the greater weight gain percentage of the samples was, and the more serious leach was in the test, after the specimen was modified with the flame retardant. When weight gain percentage of the specimens is same, the greater the concentration of PF resin test solution was, better effect of the leach resistant will be obtained with the concentration of PF test solution increased. The PF resin with 25% concentration had the best effect to reduce the leach of N-P inorganic composite retards. From the comparative analysis above, it was advisable to indicate the PF resin with 25% concentration had the best effect to reduce the leach of N-P inorganic composite retards.

WOOD RESEARCH Volume 63, Number 2, 2018
Jiayu Cong, Guochao Yang, Lijuan Zhao, and Qiuhui Zhang

The synergistic smoke suppression effect of ferric oxide on flame retardant wood-polyurethane composites

Wood flour-polyurethane composites (WPC) with ammonium polyphosphate (APP) and ferric oxide (Fe2O3) were prepared to research the cooperative influence of smoke suppression and fire resistance. By the methods of cone calorimeter test (CCT), smoke density test (SDT), thermogravimetric analysis (TG), limiting oxygen index (LOI), field emission scanning electron microscope (FE-SEM) and Fourier transform infrared spectroscopy (FTIR). Remarkably, Fe2O3 has significant improvement on heat release rate (HRR), total heat release (THR), smoke factor (SF), and total smoke release (TSR) of the APP/WPC.SDT implied that Fe2O3 played a positive role during burning and there is a synergistic effect of smoke suppressing for Fe2O3 on APP/WPC. The LOI results showed that compared with samples without flame retardant, adding Fe2O3 improved the LOI value of WPC. TG indicated that Fe2O3 and APP played an effective role in the course of thermal degradation of WPC. And the SEM and FTIR showed that Fe2O3 and APP played a role in ameliorating the residual carbon structure.