We aimed to enhance the flame retardancy of epoxy resin (EP) by synthesizing a novel, halogen-free flame retardant through a one-pot method. The synthesis utilized 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), furfurylamine (FA), and benzene propionaldehyde (BPA) as raw materials. We conducted differential scanning calorimetry (DSC) analysis to investigate the effects of FPD on the curing process and thermal properties of EP. Our findings reveal that incorporating FPD into EP can facilitate a faster curing process and increase the carbon residue post-combustion. Specifically, the FPD/EP-7 composite demonstrates a limiting oxygen index (LOI) of 34.9% and achieves a UL-94V-0 rating with a phosphorus content of 0.91wt%. These results indicate that FPD significantly enhances the thermal stability and charring rate of EP, thereby improving its flame retardancy. Although the addition of FPD slightly reduces the mechanical properties of EP, the composite material maintains excellent performance.
Wenhong Jiang,Haibo Tan,Kaiyu Tan,Zixiang Sun,Hongqiang Li,Xingrong Zeng,Jiefeng Gao,Xuejun Lai
The high-quality preservation of precious cultural artifacts requires advanced coatings with stringent demands for transparency, mechanical robustness, and ablation resistance. However, achieving an optimal balance among these performances remains a formidable plight. In this work, we propose a strategy for the synergistic self-catalytic ceramicization of an organosilicon–boron dual-network structure to address these challenges. High-transparency, ablation-resistant silicone-boron fire-retardant coatings were prepared via sol–gel processing using triethyl borate and trimethoxysilane. These coatings achieved remarkable mechanical properties with a level of 9H and flexibility characterized by a bending diameter of ≤2 mm, while maintaining a light transmittance of up to 99.9%. They also exhibited excellent adhesion to diverse substrates including glass and ceramic. The coatings effectively protected substrates from fire, achieving an UL-94V-0 rating and a limiting oxygen index of up to 35.5%. Upon exposure to a high-temperature flame, the coatings rapidly formed a compact ceramic barrier layer on the substrate surface, demonstrating outstanding ablation resistance. Furthermore, this study elucidated the mechanisms underlying the unique combination of toughness, transparency, and flame-retardant ablation resistance in silicone-boron coatings: The dual cross-linked network structure enhanced both the hardness and flexibility. Meanwhile, the synergistic catalytic effect of boron and phosphorus (Si/B/P) promoted the formation of a compact cross-linked ceramic network from silicone, effectively blocking heat and flame propagation. This work provides a versatile approach to designing transparent, ablation-resistant coatings for advanced fire protection.
危险品化学品经营许可证（带存储）