Dzina la malonda:polyurethane

Kapangidwe kazinthu zama cell:

Chemical Properties:

Polyurethane (PU), dzina lonse la polyurethane, ndi polima pawiri. 1937 ndi Otto Bayer ndi zina zopanga izi. Pali mitundu iwiri ikuluikulu ya polyurethane, polyester mtundu ndi polyether. Zitha kupangidwa kukhala mapulasitiki a polyurethane (makamaka thovu), ulusi wa polyurethane (wotchedwa spandex ku China), mphira wa polyurethane ndi elastomers.
Flexible polyurethane makamaka ndi liniya kapangidwe ndi thermoplasticity, amene ali bwino bata, kukana mankhwala, kulimba mtima ndi mawotchi katundu kuposa PVC thovu, ndi zochepa psinjika kusiyana. Ili ndi kutsekemera kwabwino kwamafuta, kutsekereza mawu, kukana kugwedezeka, komanso anti-toxic properties. Chifukwa chake, imagwiritsidwa ntchito ngati kuyika, kutsekereza mawu ndi zida zosefera. Pulasitiki yolimba ya polyurethane ndi yopepuka, yotsekereza mawu, kutchinjiriza kwapamwamba kwambiri, kukana mankhwala, mphamvu zamagetsi zamagetsi, kukonza kosavuta, komanso kuyamwa kwamadzi otsika. Amagwiritsidwa ntchito kwambiri ngati zida zomangira, magalimoto, makampani opanga ndege, kutchinjiriza kutentha komanso kutchinjiriza kwamafuta. Polyurethane elastomer ntchito pakati pulasitiki ndi mphira, mafuta kukana, kuvala kukana, otsika kutentha kukana, kukana kukalamba, mkulu kuuma, elasticity. Amagwiritsidwa ntchito makamaka m'makampani a nsapato ndi makampani azachipatala. Polyurethane imathanso kupangidwa kukhala zomatira, zokutira, zikopa zopangira, etc.

Ntchito:

Polyurethanes ndi chimodzi mwazinthu zosunthika kwambiri padziko lapansi masiku ano. Ntchito zawo zambiri zimachokera ku thovu losinthika mumipando yokwezeka, mpaka thovu lolimba ngati zotchingira m'makoma, madenga ndi zida zamagetsi ku thermoplastic polyurethane yomwe imagwiritsidwa ntchito pazida zamankhwala ndi nsapato, mpaka zokutira, zomatira, zosindikizira ndi ma elastomer omwe amagwiritsidwa ntchito pansi ndi mkati mwagalimoto. Ma polyurethanes akhala akugwiritsidwa ntchito kwambiri m'zaka makumi atatu zapitazi m'njira zosiyanasiyana chifukwa cha chitonthozo chawo, phindu lamtengo wapatali, kupulumutsa mphamvu komanso kumveka bwino kwa chilengedwe. Kodi ndi zinthu ziti zomwe zimapangitsa polyurethane kukhala yofunikira kwambiri? Kukhazikika kwa polyurethane kumathandizira kwambiri pazaka zambiri zamoyo wazinthu zambiri. Kuwonjezedwa kwa moyo wazinthu zogulitsa ndi kusungirako zinthu ndizofunikira kwambiri pazachilengedwe zomwe nthawi zambiri zimakonda kusankha ma polyurethanes[19-21]. Ma polyurethanes (PUs) amayimira gulu lofunikira la ma polima a thermoplastic ndi thermoset monga makina awo, matenthedwe, ndi mankhwala amatha kutengera momwe ma polyols osiyanasiyana ndi ma poly-isocyanate amachitira.