Igama lomkhiqizo:Polyurethane

Isakhiwo samangqamuzana somkhiqizo:

Izakhiwo zamakhemikhali:

I-Polyurethane (PU), igama eliphelele le-polyurethane, liyi-polymer compound. Ngo-1937 ngu-Otto Bayer kanye nokunye ukukhiqizwa kwalokhu okuqukethwe. Kunezinhlobo ezimbili ezinkulu ze-polyurethane, uhlobo lwe-polyester kanye nohlobo lwe-polyther. Zingenziwa nge-polyurethane plastitics (ikakhulukazi i-foam), ama-polyurethane fibers (abizwa ngokuthi i-spandex eChina), i-polyurethane enjoloba kanye nama-lastomer.
I-Flexible Polyurethane ikakhulukazi iyindlela eqondile eqondile nge-thermoplasticity, okunokuqina okungcono, ukumelana kwamakhemikhali, ukuqina kanye nezindawo zemishini ukwedlula i-PVC FOAM, ngokuhlukahluka okuncane kokucindezela. Inokufakelwa okuhle okushisayo, ukufakwa okuzwakalayo, ukumelana okuthuthumelayo, kanye nezakhiwo ezinobuthi. Ngakho-ke, isetshenziswa njengokupakishwa, ukufakwa okuzwakalayo kanye nezinto zohlunga. Ipulasitiki eqinile eqinile ingukukhanya, ukufakwa okuzwakalayo, ukufakwa okuphakeme okuphezulu, ukumelana kwamakhemikhali, izindawo ezinhle zikagesi, ukucubungula okulula kwamanzi. Isetshenziswa kakhulu njengezinto ezibonakalayo zokwakha, imoto, imboni yezindiza, ukufakwa kokushisa kanye nokufakelwa okushisayo. Ukusebenza kwe-polyurethane elastomer phakathi kwepulasitiki nenjoloba, ukumelana kawoyela, ukumelana kawoyela, ukumelana nokuphefumula, ukumelana kwamazinga okushisa, ukumelana nokuguga, ukuqina okuphezulu, ukuqina okuphezulu Isetshenziswa ikakhulukazi embonini yezicathulo kanye nemboni yezokwelapha. I-polyurethane nayo ingenziwa ngezinamathela, ukumboza, isikhumba sokwenziwa, njll.

Isicelo:

Ama-polyurethanes angenye yezinto eziguquguqukayo emhlabeni namuhla. Baningi abasebenzisa amabanga ahlukahlukene avela ku-Flexible Foam efenisha ephakeme, ukuqinisa i-foam njengokufakwa kwezindonga ezindongeni kanye nezingubo zezinyawo, ukumboza izinyawo, ukumboza ama-latastomers asetshenziswa ezitezi nasezandleni zezimoto. Ama-polyurethanes asetshenziswe ngokwengeziwe phakathi neminyaka engamashumi amathathu edlule ezinhlotsheni ezahlukahlukene ngenxa yenduduzo yawo, izinzuzo zezindleko, ukonga amandla kanye nokuzwakala kwemvelo okungaba khona. Yiziphi ezinye zezici ezenza ama-polyurethanes afiseleka kangaka? Ukuqina kwe-polyurethane kufaka phakathi kakhulu esikhathini eside sokuphila kwemikhiqizo eminingi. Izandiso zomjikelezo wempilo yomkhiqizo kanye nokulondolozwa kwezinsizakusebenza kubalulekile ukucatshangelwa okubalulekile kwemvelo okuvame ukubheka ukukhethwa kwama-polyurethanes [19-21]. Ama-polyurethanes (pus) amelela isigaba esibalulekile se-thermoplastic ne-thermoset polymers njengemishini yazo, eshisayo, nezakhiwo zamakhemikhali zingalinganiswa ngokusabela kwama-polyols ahlukahlukene kanye nama-poly-isocyanates.