Mechanical Properties and Thermal Conductivity of Insulation Boards Prepared from Recycled Glass Fibers and Recycled Thermosetting Polyurethane

In this study, fan blades and thermosetting polyurethane foam were mechanically recycled, and glass fibers of different lengths and polyurethane powders of different particle sizes were separated by crushing and screening.The recycled materials with different particle sizes and mass fractions were selected and homogeneously mixed with the matrix thermoplastic polypropylene powder, and nine groups of different composite insulation boards were prepared using hot press molding method.The tensile strength, flexural strength and thermal conductivity of different insulation boards were analyzed.The results show that when the glass fiber mass fraction is 20%, the mechanical properties can reach the maximum value, and its tensile strength and bending strength are 7.196 MPa and 13.2 MPa, respectively.The thermal conductivity can reach the minimum value of 0.091 W/(mK) when the glass fiber mass fraction is 10%.In this study, polyurethane and glass fibers were recycled at the same time to obtain insulation boards with good mechanical strength and thermal insulation properties, which provides new possibilities for the development of insulation materials.