LOW-HARDNESS POLYURETHANE STATOR USED IN SINGLE-SHAFT ECCENTRIC SCREW PUMP AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To provide a low-hardness polyurethane stator of a signal-shaft eccentric screw pump suitable for transfer of a powder (e.g.: toner) which is easily fixed by a polyester plasticizer. SOLUTION: A low-hardness polyurethane used as the stator of the single- shaft eccentric screw pump is hardened by adding alkyl naphthene or aliphatic dibasic acid ester as a chain extending agent or an additive to isocyanate group terminal prepolymer.