Ipulasitiki yePolyurethane (PU)
* I-Polyurethane (PU) isifinyezo se-polyurethane, i-polyisocyanate kanye ne-polyhydroxy polymer polymerization, isesichungechungeni esiyinhloko sama-polymer aqukethe izingxenye eziningi ze-urethane chain (-NHCOO-) eziphindaphindayo zama-polymer compounds.
* Imikhiqizo yepulasitiki ye-PU eyenziwe ngokwezifiso
I-Polyurethane, eyaziwa nangokuthi i-polyurethane kanye ne-polyurethane, iyiklasi yama-macromolecule aqukethe amayunithi ahlukile e-urethane ku-main chain. Lolu hlobo lwezinto ze-polymer lunokunwebeka kwerabha kanye namandla kanye nokusebenza okuhle kakhulu kokucubungula kwepulasitiki, futhi lunenani elikhulu lokusetshenziswa emikhakheni eyisikhombisa emikhulu yepulasitiki, irabha, i-foam, i-fiber, izembozo, izinamathiselo kanye nama-polymer asebenzayo. Kwezimboni isetshenziswa kabanzi emathayini asheshayo, ama-gasket, omata bezimoto kanye neminye imikhakha. Empilweni yansuku zonke, i-polyurethane isetshenziselwa ukwenza izinhlobo ezahlukene ze-foam kanye nesiponji sepulasitiki.
Yini ongayenza nge-PU Plastic?
Ama-elastomer e-polyurethane ayisigaba sezinto ezinezici zerabha nezepulasitiki, ezinamandla okuhle okudonseka, amandla okudabuka, ukumelana nokushayisana, ukumelana nokuklwebheka, ukumelana nesimo sezulu, ukumelana ne-hydrolysis, ukumelana namafutha nezinye izinzuzo.
Isetshenziswa kakhulu njengezinto zokwakha (njengezimbobo, ama-gasket, amabhande, ama-roller, amagiya, amapayipi, njll.), ama-insulator, ama-foot ezicathulo namathayi aqinile. Isibonelo, njengepuleti lesivingo sezimayini, inomsindo ophansi, ukungena okuphezulu kanye nokumelana nokuguguleka kunepuleti lesivingo sensimbi yendabuko. Ngaphezu kwalokho, i-polyurethane ihambisana kahle kakhulu ne-biochemical, njengezinto zokwelapha, ingasetshenziswa kuma-pacemaker, emithanjeni yegazi yokwenziwa, emathanjeni okwenziwa, njll.
Okulandelayo ezinye zezicelo zePolyurethane (PU)
- Ezokuthutha
- Ukwakhiwa
- Imishini
- Imishini kagesi
- Ifenisha
- Ukucubungula Ukudla
- Indwangu nezingubo
- Isikhumba esenziwe ngokwenziwa
- Ukuphrinta
- Imboni ye-Petrochemical
- Ezemidlalo
- Ukunakekela impilo
Izici ze-Polyurethane (PU)
* I-polyurethane foam ihlukaniswe ngezinhlobo ezimbili: i-foam eqinile ne-foam eguquguqukayo, enokuguquguquka okuhle kakhulu, ukunwebeka, amandla okucindezela kanye nokuguquguquka, kanye nokuqina okuhle kwamakhemikhali. Ngaphezu kwalokho, i-polyurethane foam inamandla okucubungula, ukunamathela, ukufudumala kanye nezinye izakhiwo, okuyingxenye yokusebenza okuhle kakhulu kwezinto zokubopha.
Ngenxa yesakhiwo sayo, i-polyurethane elastomer inezingxenye ezithambile neziqinile zamaketanga amabili, ngakho-ke uchungechunge lwama-molecule lungaklanywa ukuze lunikeze izinto amandla aphezulu, ukuqina okuhle, ukumelana nokuguguleka, ukumelana namafutha kanye nezinye izakhiwo ezinhle kakhulu, ezaziwa ngokuthi i-polyurethane "yerabha engaguguleki" ngesikhathi esifanayo ngokuqina okuphezulu kwerabha kanye nokuqina kwepulasitiki.
* Izinto ze-polyurethane zine-polarity eqinile, okwenza zikwazi ukubopha ngokuqinile nezinto eziningi futhi zingasetshenziswa njengezinamathelisi ensimini yokubopha.
* Izinamathiseli ze-polyurethane zisetshenziswa kakhulu ezimbonini zokupakisha, zokwakha, zokhuni, zezimoto kanye nezicathulo.
Izinto zePolyurethane (PU) zenziwa kanjani?
Ngenxa yokungangeni kwamanzi kwe-polyurethane, indlela entsha yokwenza kumele isetshenziswe ukulungiselela i-PU emulsion, inqubo yokwenza i-polyurethane ethwala amanzi ilandelana kanje: ① yi-oligomer polyol, i-chain extender, i-diisocyanate ukwakha isisindo sama-molecule esiphezulu se-PU pre-polymer; ② incishisiwe ngemva kokuba i-pre-polymer ixutshwe emanzini ukuze yakhe ukuhlakazeka.
Izindlela zokulungiselela i-polyurethane emulsion zinezigaba ezimbili eziyinhloko: indlela ye-external emulsification kanye nendlela ye-internal emulsification.
1. Indlela ye-emulsification yangaphandle iyindlela ye-emulsification ephoqelelwe lapho kukhona i-emulsifier, i-high shear.
2. Indlela yokuzihlanganisa ngokwayo yenziwa ngokungenisa amaqembu athanda amanzi emzimbeni wamangqamuzana we-polyurethane.
Amaqembu athanda amanzi angena emathanjeni amangqamuzana e-PU ngokwandiswa kweketanga lama-monomer athanda amanzi, akhiwa amaqembu enza usawoti kanye nama-reagent enza usawoti.
Ukuvuselelwa kabusha kwepulasitiki ye-polyurethane (PU)
- Ukuvuselelwa Kwepulasitiki yePolyurethane (PU) Kungahlukaniswa ngokuvuselelwa okungokoqobo kanye namakhemikhali.Ukuphinda usebenzise kabusha ngokomzimba kunikeza indlela ephumelelayo neyongayo yokuphinda usebenzise amagwebu aqinile e-polyurethane kanye nezinhlanganisela. Usayizi wezinhlayiya zomkhiqizo we-polyurethane foam wokuqala uqala ngokuncishiswa ube yizinga elingaphinde licutshungulwe ezinqubweni zesibili. Izinto ezisetshenziswa kabusha zikadoti, noma ukunqunywa kwenqubo yokukhiqiza, kuyawohloka kube yizinhlobo eziwusizo kakhulu njengezinhlayiya, ama-granule noma ama-powder.Ukuvuselelwa kwamakhemikhali kuyindlela yokuphula amagwebu e-polyurethane abe yizinto zokusetshenziswa ze-polyurethane noma ezinye izinto zokusetshenziswa zamakhemikhali kusetshenziswa i-alcohol, i-amineysis, i-hydrolysis noma i-pyrolysis. I-polyurethane foam inezibopho ze-urethane ne-urea. Enkambisweni ye-alcohol, i-aminolysis kanye ne-alkali hydrolysis, izibopho ze-urethane ne-urea ku-molecule ye-polyurethane ziyaqhekeka futhi ziboliswe zibe ama-polyol, ama-polyamine aromatic, i-carbon dioxide njalo njalo.
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