The impact of weathering acceleration testing on the properties of polymer composite HDPE/LLDPE/FIRE retardant additives using waste gypsum

Abstract

Gypsum is a by-product of the phosphoric acid production process from apatite ore. It is primarily stored in the disposal sites of manufacturing plants, posing environmental pollution due to its high content of untreated acids. Utilizing waste gypsum as a reinforcing and fire-retardant additive for polymer composite materials holds significant potential for applications in both industrial and environmental contexts. In this study, waste gypsum is treated to remove impurities and acids before being modified with ethylene bis(stearamide). The modified gypsum is blended with high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), and fire retardant additives at various ratios using a twin-screw PolyHaake mixer. The influence of modified and unmodified gypsum on the mechanical properties, fire resistance, and structural morphology of the polymer materials will be discussed. Additionally, the role of modified and unmodified gypsum particles in weathering resistance will be studied through the mechanical properties, fire resistance, and material structure. The application of waste gypsum contributes to the development of new fire-resistant materials, diversifies its consumption sources, and reduces environmental pollution.