| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing a cast molded article made of polyurethane porous substance by crosslinking a water-dispersed urethane prepolymer with a polyamine compound, in which a cured reactant has good demolding properties and a cast molded article with a fine structure can be easily produced; and a cast molded article having a fine structure with high dimensional accuracy. <P>SOLUTION: The cast molded article is produced by reacting a polyol, a chain extender, isocyanate and 0.1-4 wt.% of a hydrophilic chain extender to one another, allowing a resultant urethane prepolymer having a terminal isocyanate group to be mixed with and dispersed in water, mixing a resultant water-dispersed urethane prepolymer with 1,4-diaminobutane and injecting a resultant mixture into a mold for crosslinkage, and demolding a resultant cured reactant and removing moisture from the cured reactant. <P>COPYRIGHT: (C)2010,JPO&INPIT |
