polyurethane Okugcwele ngokuthi polyurethane, kuyinto amaqembu urethane bebonke uphinda (NHCOO) kwakwakhe macromolecular equkethe esikuziphathimandla main. Yenziwe i diisocyanate organic noma kwakwakhe polyisocyanate amabili noma ngaphezulu polyaddition hydroxyl. Ukusabela fomula elandelayo: -n = C = O + HO- → -NH-COO-, ngaphezu polyurethane macromolecule carbamate, ungase futhi aqukethe elithi ether, ester, urea, biuret, allophanate, njll amaqembu.
(Cyanate
Incazelo: HOC≡N (n) cyanate HN = C = O (isocyanate) has a (positive) cyanate futhi isocyanate izinhlobo ezimbili. I khulula acid adideke, hhayi ukuhlala ngokwahlukana ukuvulwa, kodwa esters kwakhona amafomu amabili. Cyanate kuyinto uketshezi oluyingozi futhi onakalisayo. Kukhona iphunga oqinile acetic acid. Ubuningi 1.14. Abilayo iphuzu 23.6 ℃. Bonisa asidi oqinile isixazululo aqueous. Engazinzile, kalula polymerization. Ammonia ne-carbon dioxide elakhiwe phakathi hydrolysis. Lapho odala carbamates kanye alcohols indima. (N) isocyanate ROC≡N polymerization lula, futhi singangena hydrolysis, etholwe ngefomu okumsulwa nzima. Isocyanate RN = C = O noma O = C = NRN = C = O, iphunga ngokuvamile ezingemnandi nge uketshezi. Cyanate cyanuric acid ingalungiswa ngu noqhekeko ezishisayo. )
imikhiqizo Polyurethane yakha elithambile, lulwimi ngendlela elukhuni futhi kube lukhuni foams, elastomers, upende, inhlaka, sealants, zokwenziwa lesikhumba enamathela inhlaka, Imicu yotshani Elastomeric, ezisetshenziswa kakhulu imoto yokukhiqiza, esiqandisini yokukhiqiza, ezokuthutha, ukwakhiwa ubunjiniyela, nezicathulo, zokwenziwa lesikhumba, zendwangu, imishini, Petrochemical, izimayini imishini, aerospace, ezempilo, ezolimo kanye neminye imikhakha eminingi.
Kuye ngezinto ezahlukene zokusetshenziswa, ungaba izinhlobo ezahlukene imikhiqizo, ngokuvamile yayiba nezinhlobo ezimbili polyester polyether. polyurethane Polyether ngokuyinhloko ukulungiselela polyurethane impahla esichaziwe polyol, a polyol polyurethane okulungiswa ngokuphelele polyol polyether noma iningi ifa uhlelo.
Polyether polyols ku ukwakheka kwama-molecule, ibhondi ether amandla athishela uphansi, futhi kulula ukujikisa, ngakho-ke kuyinto enhle aphansi-lokushisa polyurethane impahla okulungiselelwe nokwenza kwayo zazivuma, kakhulu hydrolysis ukumelana, nakuba ayengazi kwafana izakhiwo mechanical polyester polyurethane, kodwa viscosity ongaphakeme izinto, lula futhi isocyanate ingxenye izithasiselo miscible, kakhulu ukucubungula ukusebenza.
Polyester polyols ngokuvamile okukhulunywe ngumuntu dicarboxylic acid nge glycol nezinye polyester polyol ngu ukufingqa ukuphendula. Ngokuyisisekelo equkethe ester iqembu (COO) noma carbonate iqembu (OCOO) polyol. Polyurethane foams kabanzi. Foam Soft is ikakhulukazi esetshenziselwa ifenisha futhi izimoto zabo mat izinto ezihlukahlukene, ukwahlukanisa izinto; Foam eqinile nakho ngeke kusize ukwahlukanisa is ikakhulukazi esetshenziselwa izinto zasendlini, izindlu udonga ungangenisi amanzi spray Foam ukwahlukanisa, ipayipi ukwahlukanisa izinto, isakhiwo panel, amaloli esiqandisini futhi abandayo isitoreji ukwahlukanisa kanye nezinye izinto; Semi-eqinile nakho ngeke kusize Foam elisetshenziswa yezimoto ithuluzi panel, amasondo ayo nokunye. Imakethe has ezihlukahlukene ukucaciswa polyurethane foam inhlanganisela izinto (ezimbili-ingxenye premix), ikakhulukazi i-(ikhambi abandayo) nokuqinisela okusezingeni eliphezulu foams, foams semi eqinile ekubunjweni sishaye kanzima plastic foam.
(Diethyl ether
1. Lapho ingxube ethanol futhi kanzulu sulfuric acid sishisiswe 140 ℃ kungaba aphakathi imikhiqizo amanzi emzimbeni nge-ether. Kanzulu sulfuric acid njenge-ejenti dehydrating lapho kulethe.
2. Isibalo: 2 CH3-CH2-OH - catalyzed futhi wagxila H2SO4 → at 140 ℃ CH3-CH2-O-CH2-CH3 + H2O)
polyurethane elastomer
Polyurethane elastomer sisetshenziselwa izinto polyurethane esiyinhlanganisela ezihlukahlukene, ngenxa yokulandelana kwayo ngokohlu nge esithambile futhi kanzima izingxenye ezimbili, kungenziwa eklanyelwe lidlulisele impahla yamangqamuzana kokuba namandla high, ubunzima, ukugqoka ukumelana, uwoyela ukumelana, ukusebenza kakhulu, kokubili ne injoloba kokuba okusezingeni eliphezulu kuyaqina kanye rigidity epulasitiki ngokuthi "ukugqoka nemithi zenjoloba."
manje Polyurethane elastomer ungasebenzisa efanayo jikelele iraba mastication, ukuxuba, elapha inqubo yokubumba (ubheke MPU); futhi akhiwe ngerabha ketshezi, waphonsa udini noma ukufafaza, ekubunjweni, udini centrifugal (ubheke CPU); Ungase futhi uzilungiselele ku zithutha, futhi, efana plastic abavamile, umjovo, extrusion, calendering bhaklu udini nezinye izinqubo (CPU). Udini noma umjovo olubunjiwe izingxenye, kwibanga ezithile ubulukhuni, kodwa futhi kungenziwa usike, ukugaya, imishini kanye nezinye machining. Ukucubungula ukwahlukana kwabantu, isifundo elastomer polyurethane ukusebenza ebanzi kakhulu, izicelo iqhubeka yanda.
Amafutha ukumelana, i-ozone ukumelana, ukuguga ukumelana, ukumelana emisebeni, izinga lokushisa ongaphakeme, okusobala umsindo okuhle, adhesion eqinile, biocompatibility kakhulu futhi igazi kwedivayisi. Lezi izinzuzo iyona elastomer polyurethane ezisetshenziswa kakhulu yamasosha, Aerospace, umsindo, i-biology nezinye izizathu.
Inzuzo enkulu polyurethane elastomer:
1, ukusebenza uhla adjustable. Inani izinkomba ngokomzimba futhi mechanical kungase kushintshwe by Ukukhetha of izinto zokusetshenziswa kanye ukwakhiwa, kwibanga ezithile, ukuhlangabezana nezidingo ezahlukene ukuze uthole ukusebenza umkhiqizo. Ezinjalo njengoba ubulukhuni, ngokuvamile i Isikhombisi esibalulekile abasebenzisi yomkhiqizo, kokubili eyenziwe polyurethane elastomer Shore A nobulukhuni 20 noma ngakho ukuphrinta ezinamasondo soft, kodwa futhi wenza ezingaphezu kwezingu-70 Shore D nobulukhuni iraba kanzima roller elendlalekile, lena Elastomeric jikelele impahla nzima ukwenza. Polyurethane elastomer kuyinto polar polymer impahla yakhiwa izingxenye eziningi izingxenye kanzima sakhiwa uchungechunge nezimo, nokwenza kangcono futhi izithelo polar iqembu ukuminyana ingxenye kanzima Ingxenye elastomer amandla yokuqala kanye ubulukhuni izokwenyuka ngokufanele.
2, aphakeme bafake ukumelana. Ikakhulukazi lapho kukhona amanzi, amafutha ogelezayo nokumanzisa izimo naphakathi zokusebenza olukhona, ukumelana bafake ngokuvamile izikhathi eziningana ukuba izikhathi eziningana izinto iraba ezejwayelekile. Izinto zensimbi ezifana steel, nakuba kunzima kakhulu, kodwa akusho lokho ngempela ukugqoka, ezifana futha ezinkulu ngenkasa indawo Yellow River, yezingxenye Ukuvikelwa overcurrent nomlomo metal indandatho indandatho ngemva eziningi inzika ukuguguleka komhlabathi, akuthathi amakhulu amahora ezinzima ukugqoka ukuvuza, ngenkathi ukusetshenziswa polyurethane elastomer camera umlomo indandatho kanye nokuvikelwa ring operation okuqhubekayo 1800 ibe incane kodwa ukugqoka. Abanye, njengalabo umshini irayisi Milling esetshenziswa iraba roller hulling, isixwayisi isikrini ngesihlungo yamalahle Ukulungiselela kanye ithrekhi inkundla evulekile, izimvu zamanzi ashukumisayo amafutha asetshenziswa Forklift crane ikheshi isondo nesondo roller skates, njll futhi polyurethane elastomer Iza. Kulesi inkomba Iphuzu liwukuthi okudingekayo ekuthuthukiseni Coefficient friction we ephansi ubulukhuni ilungu polyurethane elastomer, ukuthuthukisa ukugqoka ukumelana ngaphansi komthwalo ukuzala, ungakwazi ukwengeza inani elincane aluminium disulfide, graphite noma uwoyela abicah endaweni elastomer polyurethane ezinjalo, njll igrisi.
isikhathi Iposi: Nov-24-2018