Flammability Procrastination Obtained for the Natural Fabrics by Deposition of Silica Core-Amine Shell Microspheres through Dip-Coating Process

In this study, we synthesized a SiO2-APTES core-shell microsphere (Si-NH2-MS) flame retarding material (FRM) as a heat shielding layer on natural fabrics, such as jute, cotton, and flax(cellulose) fibers. By dip-coating deposition of charged anionic and cationic polyelectrolytes to generate thin multilayer coatings on the surface of the fabrics via electrostatic interactions, this integration was made to increase the flame retardancy property of pure jute, pure cotton, and pure flax fibres. Additionally, through interionic interactions, a strong gluing mechanism occurs between the fabric surface and Si-NH2-MS. Pure jute, pure cotton, and pure flax burned completely within 14, 12, and 10 s, respectively, whereas 2 wt% Si-NH2-MS treated jute, cotton, and flax fibers showed delayed burning times of 21, 18, and 15 s, respectively. Furthermore, 5 wt% Si-NH2-MS treated jute, cotton, and flax fibers showed delayed burning times of 48, 41, and 23 s, respectively, due to the thermal insulation layers developed by the proposed Si-NH2-MS, which were coated uniformly on the surface of the fibers with the help of covalent bonds. Moreover, ignition resistance and self-extinguishing competencies have been observed on fabrics coated with 5 wt% of Si-NH2-MS, which could be a great advantage for indoor fire quenching applications.

The present results suggest a higher flame retardancy property that allows the enhancement of HRR and heat-flow effects to consequently present a high-performance, next- generation, flame-retardant material. Based on the present encouraging results, we plan to explore next-generation, high-performance, flame-retardant materials with economic viability.