I-Toluene Diisocyanate (CAS 26471-62-5): Izinto Eziyitshe Legumbi Eziqhuba Ukuthuthuka Kwemboni Ye-Polyurethane kanye Nokuguqulwa Okusimeme

I-Toluene diisocyanate (TDI, CAS 26471-62-5), ikhemikhali ebalulekile ephilayo esetshenziswa kabanzi ochungechungeni lwenani le-polyurethane lomhlaba wonke, iyaqhubeka nokusekela ukukhula kwezimboni, ukwakhiwa, izimoto, ifenisha kanye nemikhakha yezimboni. Iqhutshwa yizinqubomgomo ezisebenzisa ikhabhoni ephansi, ukuthuthukiswa kobuchwepheshe kanye nesidingo esiguqukayo semakethe yokugcina, umkhakha we-TDI ungena esigabeni esisha sokuthuthukiswa okuluhlaza, ukusebenza kahle okuphezulu kanye nenani eliphezulu.

Njengenhlanganisela ye-diisocyanate esabela kakhulu, i-TDI ikhiqizwa ngokuyinhloko njengengxube yama-isomers angu-2,4- kanye no-2,6. I-polymerize kalula ngama-polyol ukuze yakhe izinto ze-polyurethane ezibonisa ukuqina okuvelele, ukumelana nokuguguleka, ukuqina kwesimo sezulu kanye nokusebenza kokushisa. Lezi zakhiwo zimise i-TDI njengezinto zokusetshenziswa ezingenakuphikwa kuzo zonke izinhlelo zokusebenza zezimboni eziningi.

Ngaphezu kwamaphesenti angama-70 okusetshenziswa kwe-TDI emhlabeni wonke kusetshenziswa i-polyurethane foam eguquguqukayo, esebenza njenge-cushion eyinhloko yomatilasi, amasofa, izihlalo zezimoto kanye nokufakwa kwe-acoustic. Ezinye izinhlelo zokusebenza ezinkulu zifaka phakathi izembozo ezisebenza kahle, izivalo zokwakha, izinamathiseli zezimboni, ama-polyurethane elastomers, isikhumba sokwenziwa kanye nama-membrane okuvimbela amanzi. Isidingo sisalokhu sizinzile phakathi kokukhula kwedolobha, ukuthuthukiswa kwezindawo zokuhlala kanye nezitayela zokukhanyisa izimoto.

Ngokuphendula imithethonqubo eqinile yezemvelo nokuphepha, imboni isheshise ukwamukelwa kwezinhlelo zokukhiqiza ezihlanzekile nezihlakaniphe kakhulu. Ubuchwepheshe bokulawula ukukhishwa kwegesi okuqhubekela phambili, ukubuyiswa kokushisa okulahlwayo kanye nobuchwepheshe bokulawula ukukhishwa kwegesi okuvaliwe kuye kunciphisa kakhulu ukusetshenziswa kwamandla kanye nokukhishwa kwegesi okungcolisayo ngeyunithi ngayinye yomkhiqizo. Ucwaningo ngemizila engeyona i-phosgene kanye ne-TDI esekelwe ku-bio-based mass-balanced luye lwenza intuthuko enkulu, lwehlisa izinyathelo zekhabhoni futhi lwasekela imigomo yezomnotho ojikelezayo.

Ukuguquguquka kokuhlinzekwa kanye nesidingo somhlaba wonke kuye kwanda ngokulinganisela eminyakeni yamuva nje. Ukuthuthukiswa kwamandla kanye nokukhiqizwa okuhlanganisiwe kuthuthukise ukuzinza kokusebenza kanye nokuncintisana kwezindleko. Ukwanda kwamanani okuthumela kwamanye amazwe kuye kwanda ukungena emakethe yamazwe ngamazwe, kuyilapho isidingo esingezansi siye sahlukahluka saya ekugqokeni okusebenzayo okuphezulu, izinhlanganisela zezimoto, izingxenye ezintsha zamandla kanye nama-polymers ebanga lezokwelapha.

Njengekhemikhali eyingozi engaphansi kwemithetho eqinile yezokuthutha nokuphatha emhlabeni wonke, imboni ye-TDI igcina ukuphathwa okuqinile kokuphepha kuyo yonke imikhakha yokukhiqiza, yokugcina, yokuthutha kanye nokusetshenziswa kwayo. Izinqubo zokusebenza ezijwayelekile, izidingo zemishini yokuzivikela yomuntu siqu kanye nezinqubo zokuphendula eziphuthumayo zisetshenziswa kabanzi ukuqinisekisa impilo yomsebenzi kanye nokuphepha kwemvelo.

Uma sibheka phambili, i-TDI izohlala ibalulekile embonini yomhlaba wonke ye-polyurethane. Ukuqhubeka nokusungula izinto ezintsha ekukhiqizeni okuluhlaza, ukucwengisiswa kobumsulwa obuphezulu kanye nezinto ezisekelwe ku-bio kuzothuthukisa kakhulu amandla ayo okusetshenziswa. Isekelwa yisidingo semakethe yokugcina esiqinile kanye nezinqubomgomo zentuthuko esimeme, i-TDI ikulungele ukuletha inani lesikhathi eside ngenkathi ithuthukisa ukuguquka kwekhabhoni ephansi kwemikhakha yokukhiqiza yamakhemikhali kanye nethuthukile.