A method of treating reaction injection molded polyurethane, polyurethane/urea and polyurea polymers comprising exposing a reaction injection molded polyurethane, polyurethane/urea or polyurea polymer to an amount of infrared energy sufficient to increase the temperature of the polymer to at least 180° C., and then maintaining the temperature of the polymer at or above that temperature, for a time sufficient to increase the Gardner impact property, as measured using ASTMD-3029, when compared to the same polymer which has been heated to the same temperature and maintained thereat for the same time in a convection oven. The invention produces marked improvements in impact, heat sag and heat distortion temperature properties, and thus is particularly suited to rapid preparation of parts using a mass production conveyor and is particularly well-suited to preparation of parts which are to be subjected to later high temperature processes, such as the “E-coat” process.
一种处理反应注塑聚
氨酯、聚
氨酯/
尿素和聚
脲聚合物的方法,包括将反应注塑聚
氨酯、聚
氨酯/
尿素或聚
脲聚合物暴露于足以使聚合物温度升高至至少 180 摄氏度的红外线能量中,然后将聚合物的温度保持在该温度或以上,时间足以提高用 ASTMD-3029 测量的加德纳冲击特性、然后将聚合物的温度保持在该温度或更高的温度上一段时间,与在对流烘箱中加热 到相同温度并保持相同时间的同种聚合物相比,足以提高使用 ASTMD-3029 测量的加德纳冲击性能。本发明明显改善了冲击、热塌陷和热变形温度特性,因此特别适用于使用批量生产传送带快速制备零件,尤其适用于制备要进行后期高温工艺(如 "E-涂层 "工艺)的零件。