Shape memory tube and forming method for the same |
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| 申请号 | JP26049188 | 申请日 | 1988-10-18 | 公开(公告)号 | JPH02107431A | 公开(公告)日 | 1990-04-19 |
| 申请人 | Mitsubishi Heavy Ind Ltd; | 发明人 | SHIMIZU MAKOTO; HAYASHI SHUNICHI; | ||||
| 摘要 | PURPOSE: To perform melting and molding such as injection molding, extrusion molding, etc. by deforming a tube at a temperature higher than the glass transition point of polymer molded in a tubular shape of shape memory polyurethane elastomer and lower than a molding temperature, and then cooling it to a temperature lower than the glass transition point. CONSTITUTION: Bifunctional diisocyanate, polyol and bifunctional chain elongation agent containing active hydrogen group are employed as materials, mixed at a molar ratio by diisocyanate : polyol : chain elongation agent = 2.00 - 1.10 : 1.00 : 1.00 - 0.10, and polymerized by a prepolymer method to generate polyurethane elastomer. The shape memory polyurethane elastomer in which [NCO] and [OH] are contained substantially in equal quantity at the ends thereof, and which has glass transition points of -50 - 60°C and crystallinity of 3 - 50wt.% is employed. This is molded in a tubular shape, stored in a basic shape, deformed to the tube at a temperature higher than the glass transition point of the polymer and lower than a molding temperature, and cooled to the temperature lower than the glass transition point as it is to employ a solidified second shape. COPYRIGHT: (C)1990,JPO&Japio |
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