The free toluene diisocyanate(TDI) in the curing agent TDI-TMP(Trimethylol Propane) of polyurethane was separated in laboratory by means of high-vacuum two-stage thin-film evaporation.
The thin film can be prepared by a plurality of film plating techniques such as highvacuum thermal evaporation, electron beam deposition and sputtering.
该薄膜可采用高真空热蒸发、电子束沉积以及溅射等多种镀膜技术制备。
3
In respect of the producing method, refined and high unmixed salt is usually made by multiple effect evaporation in vacuum, when man-made bittern is needed.