lyu Full ebizwa lyu, kuba amaqela urethane ngokuhlangeneyo phinda (NHCOO) compound macromolecular equlathe kwi kwikhonkco engundoqo. Yenziwe i diisocyanate ephilayo okanye ezimbaxa polyisocyanate kunye ezimbini okanye ngaphezulu polyaddition hydroxyl. Ifomula abasabela ilandelayo: -n = C = O + besinye → -NH-COO-, ukongezelela lyu macromolecule carbamate, nazo ziqulathe iEtere, uEster, urea, biuret, allophanate, njl amaqela.
(Cyanate
Description: HOC≡N (n) cyanate HN = C = O (isocyanate) has a cyanate kunye (positive) iintlobo ezimbini isocyanate. I free acid ngumxube zombini, hayi ukungcola lokuvula, kodwa esters zayo iindlela ezimbini. Cyanate na ulwelo eguqukayo kwaye entsimbini. Kukho livumba oluluqilima acetic acid. Density 1.14. Ukupheka point 23.6 ℃. Bonisa iasidi esomelela isisombululo zolwelo. Uxhaphazelayo, ngokulula polymerization. Ammonia kunye carbon dioxide eyenziwe ngexesha haydrolisis. Xa odala carbamates kunye alkoholi indima. (N) isocyanate ROC≡N polymerization lula, yaye sengozini haydrolisis, yayifunyenwe ngendlela ecocekileyo nzima. Isocyanate YE = C = O okanye O = C = NRN = C = O, ivumba elibi ngokubanzi kulwelo. cyanuric acid Cyanate nga eziqulunqwe yokubola thermal. )
iimveliso lyu elithambileyo, semi-ngqongqo kwaye ngqwabalala amagwebu, elastomers, ipeyinti, yokuncamathelisa, sealants, zokwenziwa yesikhumba ukutyabeka nentlaka, imicu elastomeric, esisetyenziswa ngokubanzi emotweni mveliso, ifriji mveliso, ukuthuthwa, ukwakhiwa civil engineering, izihlangu, isikhumba zokwenziwa, textile, oomatshini, petrochemical, oomatshini kwemigodi, aerospace, zonyango, ezolimo kunye nezinye iinkalo ezininzi.
Kuxhomekeka izinto ezahlukeneyo ekrwada, unokuba iindidi ezahlukeneyo iimveliso, ngokubanzi iindidi ezimbini ipholiyesta kunye polyether. lyu Polyether ikakhulu ukulungiselela izinto lyu lochaziweyo polyol, a polyol lyu ukuba ukulungele ngokupheleleyo polyol polyether okanye uninzi ilifa kule nkqubo.
Polyether polyols kulwakhiwo molecule, nolwalamano kaEtere amandla oluhlangeneyo lisezantsi, kwaye kulula ukuba phendula, ngoko ke into elungileyo lyu ephantsi-lobushushu elungiswe yi yokusebenza kwayo inokusityeda, ukumelana obalaseleyo haydrolisis, nangona kwafana iimpawu yokugaya ipholiyesta lyu, kodwa viscosity ephantsi izinto, icandelo ongeziweyo lula kwaye isocyanate miscible, intsebenzo entle processing.
polyols ipholiyesta na ukubizwa yi acid dicarboxylic kunye ethers kunye nezinye polyol ipholiyesta yi amafu reaction. Ngokubanzi equlethe Iqela Ester (COO) okanye iqela carbonate (OCOO) polyol. amagwebu lyu zisetyenziswa kakhulu. amagwebu Soft esisetyenziselwa yefanitshala kunye nezithuthi zezixhobo ukhuko ezahlukeneyo, izinto usambathisa; amagwebu eqine ukwambathisa esisetyenziselwa izinto zasendlini, udonga izindlu ukuba zingangenwa alephuze amagwebu spray yokugquma, izixhobo umbhobho yokugquma, iiphaneli isakhiwo, iilori refrigerated kunye ubushushu ebandayo yogcino kunye nezinye izinto; semi-ngqongqo amagwebu ezisetyenziswa panels isixhobo izithuthi, ivili lokuqhuba kunye njalo njalo. Le imakethe ezahlukeneyo iinkcukacha ze lyu amagwebu indibanisela lwezixhobo (candelo-ezimbini ipremix), ikakhulu ngenxa (unyango kubanda) amagwebu ukomelela eliphezulu, amagwebu semi-engqongqo, bephosa kwaye ukutshiza nzima amagwebu zeplastiki.
(Diethyl kaEtere
1. Xa umxube ethanol kunye kanzulu sulphuric acid lenziwa lashushu 140 ℃ nga aphakathi iimveliso emzimbeni kunye kaEtere. sulphuric acid wamandla njenge arhente dehydrating apho kuvala.
2. Isibalo: 2 CH3-CH2-OH - catalyzed kwaye wagxila H2SO4 → kwi 140 ℃ CH3-CH2-O-CH2-CH3 + H2O)
lyu elastomer
Lyu elastomer kuyinto material lyu labalandeli ezahlukeneyo, ngenxa isakhiwo sayo kunye soft and hard amacandelo amabini, singayilwa ukuba bamnike izinto eziphilayo ukuba amandla aphezulu, ubulukhuni, anxibe ukumelana, ukumelana ioli, ukusebenza kakuhle, zombini ngerabha ukuba phezulu luthambe nokoma yeplastiki, ebizwa "ukunxiba-enganyangekiyo irabha."
Ngoku lyu elastomer Ungasebenzisa jikelele yerabha mastication efanayo, ukuxuba, ephilisa inkqubo ukubumba (jonga MPU); kwakhona irabha elulwelo, uphose ukubumba okanye ukuspeyita, eyahlulayo, udini centrifugal (jonga CPU); nayo ilungiswe ibe iingqalutye, yaye, ezifana neplastiki esiqhelekileyo, inaliti, extrusion, calendering, nibethe yokubumba kunye nezinye iinkqubo (CPU). Umqolo okanye amalungu inaliti otyhidiweyo, ngaphakathi kuluhlu ezithile yokuqaqadeka, kodwa unako yonqanyulwa, besila, ukubhola kunye nezinye machining. Uqwalaselo iyantlukwano, loo elastomer lyu ukusebenza ebanzi kakhulu, izicelo kuqhubeka ngokwandisa.
elana oyile, ukumelana ozone, ukumelana ukwaluphala, ukumelana radiation, iqondo elisezantsi, oluselubala isandi elungileyo, adhesion eyomeleleyo, biocompatibility ezibalaseleyo ukuhambelana negazi. Ezi iingenelo ke elastomer lyu esisetyenziswa ngokubanzi kwi emkhosini, aerospace, umsindo, ibhayoloji kunye nezinye izizathu.
Eyona inzuzo lyu elastomer:
1, ukusebenza uluhlu adjustable. A Inani kwezalathisi ngokwasemzimbeni kunye mechanical zilungiswe yi ukhetho izinto ekrwada kunye nemixube, phakathi iqela elithile, ukuhlangabezana neemfuno ezahlukeneyo ukwenzela ukusebenza imveliso. Ezifana lukhuni, kudla kungasisalathisi esibalulekileyo sokuba abasebenzisi imveliso, bobabini ezenziwe lyu elastomer Shore A yokuqaqadeka izileyi ezithambileyo yokushicilela 20 okanye ngokunjalo, kodwa wenza ngaphezulu kwe 70 Shore yokuqaqadeka irabha nzima mqengqeleki ngokuthimba D, oku elastomeric jikelele izinto nzima ukuyenza. Lyu elastomer kuyinto material Polymer polar owakhiwa ngayo amacandelo amaninzi kunye namacandelo nzima ubunjwe chain bhetyebhetye, kunye nokuphuculwa kunye nongeniselo polar iqela mninzi ingxenye nzima umyinge elastomer amandla original kanye nekuba ziza kwandiswa ngokufanelekileyo.
2, ukumelana wear ophezulu. Ingakumbi apho kukho amanzi, ioli ilele iimeko eliphakathi zokusebenza ezikhoyo, umlo banxibe idla izihlandlo eziliqela ukuya izihlandlo eziliqela izinto eziqhelekileyo ngerabha. Iimathiriyeli zentsimbi ezifana nesinyithi, nangona nzima kakhulu, kodwa ke akunyanzelekanga ukuba banxibe, olufana nonkcenkcesho indawo yokumpompa enkulu Yellow River, ebengumsesane amacandelo ukhuseleko uphuphumalo kunye umlomo metal umsesane emva eninzi ukhukuliseko intlenga, akuthathi amakhulu iiyure esiqatha banxibe ukuvuza, lo gama ukusetyenziswa lyu elastomer camera ring umlomo kunye nokukhuselwa ring i operation okuqhubekayo 1800 ibe encinane kodwa banxibe. Abanye, ezifana umatshini irayisi wokugaya kusetyenziswa rubber mqengqeleki hulling, eshukuma screen yokugalela Coal Ukulungiswa ulandelele bala moya, seals ioli enamandla kusetyenziswa ngexhanti crane sifikelele ivili kunye mqengqeleki ivili izihlangu zam, njl nawo lyu elastomer ifike. Kule incopho yothelekiso yi abadinga ukuphucula 'ngumlingani ka iimpikiswano zochuku i ephantsi yobulukhuni ilungu lyu elastomer, ukuphucula anxibe ukuxhathisa phantsi lokuzala umthwalo, ungadibanisa imali encinci-aluminiyam disulfide, grafayithi okanye oli abicah kwindawo enjalo elastomer lyu, njl igrisi.
ixesha Post: Nov-24-2018