Service Life Prediction for Polyurethane Used in Air

The laboratory accelerated aging tests of the polyurethane were carried out.The mechanical properties of the aging polyurethane were measured.The rule of elongation at break and aging time was studied.The service life prediction functions of polyurethane were established and service life at 25 ℃ were estimated basing on the index of elongation at break.The result showed that mathematic relation of elongation at break and aging time followed E = 626exp(-kt^0.78),and the predicted service life of polyurethane was 18.17 a at 25 ℃.