Leather Solid Waste–Derived Collagen Polypeptide Based Foam for the Sustainable and Clean Production of Foam-Based Extinguishing Agents

Herein, a novel leather solid waste–derived collagen polypeptide (CP)–based foam (CF) is developed with good chemical stability, good degradability, considerably poor metal corrosive properties, and high-efficiency fire-extinguishing properties. The developed CP is used as a raw material to obtain CF via free-radical emulsion polymerization using maleic anhydride and oleic acrylic resins. Thereafter, a foam-based extinguishing agent (FP) with ideal flame retardant properties is synthesized by blending the obtained CF with common and fluorine-containing (sodium perfluoro nonyloxybenzenesulfonate) surfactants. The prepared materials are characterized using Fourier-transform infrared spectroscopy, X-ray diffraction, fire-extinguishing effect, and other analytical techniques. Results show that the synthesized FP exhibited good thermal and chemical stabilities as well as considerably low cytotoxicity and biotoxicity. A spreading test and preliminary fire-extinguishing test on an oil surface indicated that the FP has a relatively high spreading speed and good air-insulation performance. In particular, compared with that of a traditional extinguishing agent, the full spreading time of 7-FP is 40% lower, with the total extinguishing time being 28 s. Overall, the results suggested that the prepared CP materials are effective extinguishing agents and may have notable value in various fireproofing applications.