Construction of hydrophobic core-shell flame retardant: A novel strategy towards reducing fire hazards and reinforcing mechanical properties of polypropylene

• Published in: Applied clay science Vol. 251; p. 107297
• Main Authors: Hu, Jie, Hu, Jia-Yan, Chen, Yu-Jie, Tan, Liu, Luo, Qian, Yan, Wen-Juan, Tang, Zhe-Hong, Zhang, Juan-Juan, Wang, Lei, Wang, Nai-Liang, Xu, Sheng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2024
• Subjects: Cyanuric chloride; Flame retardant; Hydrophobicity; Layered double hydroxide; Tannic acid; Tannic acid; Flame retardant; Cyanuric chloride; Hydrophobicity; Layered double hydroxide
• ISSN: 0169-1317; 1872-9053
• DOI: 10.1016/j.clay.2024.107297

In order to expand the application of polypropylene (PP) in the field of systems and overcome the shortcomings of layered double hydroxide (LDH) in flame retardancy and smoke suppression, a novel organic and inorganic hybrid core-shell type flame retardant was designed and prepared in this work. The flame retardant took LDH as the core, intumescent flame-retardant (IFR) generated by the condensation reaction of tannic acid (TA) and cyanuric chloride (CC) as the shell layer to construct the core-shell structure, and used the property of TA chelating Fe to integrate several flame-retardant materials (LDH@TA-CC-Fe). It was worth noting that the PP/20%LDH@TA-CC-Fe composites could pass the vertical combustion rating (UL-94) V0 rating and achieve a limit oxygen index (LOI) of 30.2% after adding 20 wt% LDH@TA-CC-Fe. Compared with Neat PP, peak heat release rate (PHRR), total heat release (THR), and total smoke production (TSP) of PP/20%LDH@TA-CC-Fe composites were reduced by 45.9%, 50.3%, and 36.5%, respectively. [Display omitted] •The hydrophobic core-shell flame retardant LDH@TA-CC-Fe hybrids was synthesized successfully.•The LOI value of PP/20%LDH@TA-CC-Fe is 30.2%, and the UL-94 grade reaches V0 rating.•PP/20%LDH@TA-CC-Fe exhibited low-value of HRR, THR, and TSP, which are 432.82 kW∙m−2, 38.35 MJ∙m−2, 10.12m2.•The reinforcements attributed to the cooperative effect between LDH and IFR.