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Bio-based sodium alginate/ammonium polyphosphate aerogel-coated rigid polyurethane foam: A sustainable approach for
Yefang Gao1, Wenjie Tang2, Rui Wang1
1School of Architecture and Civil Engineering, Anhui University of Technology, Ma'anshan, Anhui 243002, China; Anhui Province Key Laboratory of Environment friendly Polymer Materials, Anhui University, Hefei 230601, China.
Abstract:
In order to overcome the fire risk of rigid polyurethane foam, this work aims to construct APP/SA/TEOS aerogel fire-proof coating on the surface of RPUF by vacuum freeze-drying, and the effect of the coating on the flame retardancy, thermal insulation and char formation properties of RPUF were systematically investigated. The results of thermogravimetry analysis (TG) shows that the APP/SA/TEOS aerogel coating endows the RPUF with better thermal stability, and the residual char at 700 °C is 198 % higher than that of the pure sample. Meanwhile, the LOI value was greatly improved to 60 vol%. Cone calorimeter test (CCT) further proves that the coating effectively delays the ignition time, reduces the effective heat of combustion and total heat release (THR), and increases the fire performance index (FPI) and reduces the fire growth index (FGI), showing excellent fire protection performance. In addition, the thermal conductivity of the coated RPUF is only 0.0281 W/(m·K), endowing it with excellent thermal insulation performance. This work provides a certain theoretical basis and experimental foundation for the development of aerogel based flame retarded rigid polyurethane foam. The research can be applied to the construction field to improve the fire insulation performance of building materials and ensure architectural safety.
