Material recycling of high hardness solid polyurethanes
Polimery 2002, No 4, 273
High hardness cast polyurethanes (PURM) filled with waste polyesterurethane powder hardness similar to new PURMs were investigated. A process for manufacturingsuch recycled products without micropore defects was developed. Effect of recycled material content (up 20% by weight) and gram size of waste (non-fractionated with gram size under 1.5 mm and fractionated 0.4 — 1.0 mm, see Table 1) on mechanical properties (Young's modulus, tearing strength, tensile strength, abrasive wear, elongation at break, and number of cycles to break — see Figs. 3—14) was determined. Results show that recycled PURMs may be treated as powder compositions. Low disintegration and logistics costs of the investigated waste allow reduction of PURM manufacturing costs by 14—19%.
Keywords: material recycling, duroplastic polyurethane, high hardness solid polyurethane, mechanical and useful properties