Aramid/alginate blended nonwoven fabrics: thermal degradation properties, flame-retardant mechanism and smoke suppression

PurposeIn this paper the aim is that Aramid/alginate blended nonwoven fabrics were prepared, and the flame retardancy of the blended nonwoven fabrics was studied by thermogravimetric analysis, vertical flame test, limiting oxygen index (LOI) and cone calorimeter test.Design/methodology/approachThe advantages of different fibers can be combined by blending, and the defects may be remedied. The study investigates whether incorporating alginate fibers into aramid fibers can enhance the flame retardancy and reduce the smoke production of prepared aramid/alginate blended nonwoven fabrics.FindingsThermogravimetric analysis indicated that alginate fibers could effectively inhibit the combustion performance of aramid fibers at a higher temperature zone, leaving more residual chars for heat isolation. And vertical flame test, LOI and cone calorimeter test testified that the incorporation of alginate fibers improved the flame retardancy and fire behaviors. When the ratio of alginate fibers for aramid/alginate blended nonwoven fabrics reached 80%, the incorporation of alginate fibers could notably decreased peak-heat release rate (54%), total heat release (THR) (29%), peak-smoke production rate (93%) and total smoke production (86%). What is more, the lower smoke production rate and lower THR of the blends vastly reduced the risk of secondary injury in fires.Originality/valueThis study proposes to inhibit the flue gas release of aramid fiber and enhance the flame retardant by mixing with alginate fiber, and proposes that alginate fiber can be used as a biological smoke inhibitor, as well as a flame retardant for aramid fiber.

Automated summary

This study investigates the flame retardancy of Aramid/alginate blended nonwoven fabrics by incorporating alginate fibers into aramid fibers. The results show that alginate fibers effectively inhibit the combustion performance of aramid fibers and improve the flame retardancy and fire behaviors of the blends. The incorporation of 80% alginate fibers notably reduces the peak-heat release rate, total heat release, peak-smoke production rate, and total smoke production of the blends. This study suggests that alginate fibers can be used as a biological smoke inhibitor and a flame retardant for aramid fiber, reducing the risk of secondary injury in fires.