Abstract: Taking perishable organic waste as the main framework, a cross-linked system of “acrylic acid grafting+methylene diacrylamide” was constructed, and sodium dihydrogen phosphate/magnesium sulfate was introduced for flame retardant regulation. Meanwhile, the water absorption and water retention, mechanical properties and flame retardancy of gel were systematically evaluated. The research results showed that the gel water retention rate was equal or over 30% and the swelling rate within 72 hours was 1.91-2.44 g/g. Under simplified loading conditions, the deformation of a 300 g load was approximately 0.5 cm. Horizontal burning met the HB grade flame retardant standard, and vertical burning met the V-0 grade. In this study, kitchen waste has been used to replace high-purity natural polymer materials to achieve low-cost resource utilization. The mechanism of “high water content thermal barrier+acid source carbon promotion/inorganic heat absorption” has been coupled in the same system, and the flame retardancy evaluation has been completed based on standardized criteria.

Key words: perishable organic waste, hydrogel, fire-proof material, flame retardant property