PU polyurethane Introduction

Full polyurethane otchedwa polyurethane, ndi pamodzi kubwereza magulu urethane (NHCOO) macromolecular pawiri munali mu unyolo waukulu. Chopangidwa kuchokera diisocyanate wopanda feteleza kapena polyisocyanate pawiri ndi awiri kapena kuposa hydroxyl polyaddition. Anachita izi chilinganizo: -N = C = O + Ho → -NH-COO-, kuwonjezera pa polyurethane macromolecule carbamate, kodi muli efa, Ester, urea, biuret, allophanate, etc. magulu.

(Cyanate

Description: HOC≡N (n) cyanate HN = C = O (isocyanate) ali (zabwino) cyanate ndi mitundu isocyanate awiri. Asidi ufulu ndi osakaniza a onse, osati kulekanitsidwa kutsegula, koma esters ake ndi pawiri. Cyanate ndi loopsali ndi zikuwononga zakumwa. Pali fungo amphamvu asidi acetic. Kachulukidwe 1:14. Otentha mfundo 23,6 ℃. Onetsani acidity amphamvu amadzimadzi njira. Wosakhazikika, mosavuta polymerization. Ammonia ndi mpweya woipa kwaiye pa hydrolysis. Pamene kupoletsa carbamates ndi alcohols udindo. (N) isocyanate ROC≡N polymerization zosavuta, ndi atengeke hydrolysis, chinapezeka mwa mawonekedwe woyera kovuta. Isocyanate RN = C = O kapena O = C = NRN = C = O, zambiri zosasangalatsa fungo ndi madzi. Cyanate asidi cyanuric angathe kukonzekera ndi kuwonongeka matenthedwe. )

Polyurethane mankhwala kupanga zofewa, theka-okhwima ndi okhwima foams, elastomers, utoto, zomatira, mankhwala ena omatira, kupanga zikopa ❖ kuyanika resins, elastomeric ulusi, ankagwiritsa ntchito mu kupanga galimoto, firiji kupanga, kayendedwe, kumanga zomangamanga, nsapato, chikopa kupanga, nsalu, makina, petrochemical, makina migodi, Azamlengalenga zachipatala, ulimi ndi zina zambiri.

Malinga zipangizo zosiyanasiyana yaiwisi, akhoza kukhala osiyanasiyana mankhwala, ambiri mitundu iwiri ya poliyesitala ndi polyether. Polyether polyurethane zimagwiritsa polyurethane nkhani yokonza kumatanthauza kuti polyol, ndi polyol polyurethane kuti zakonzedwa kwathunthu kwa polyol polyether kapena ambiri cholowa dongosolo.

Polyether polyols mu dongosolo la maselo, ndi efa chomangira cohesive mphamvu ndi otsika, ndi zophweka kuti atembenuza, choncho ndi bwino otsika kutentha polyurethane zinthu kukonzekera ntchito zake supple, kwambiri hydrolysis kukana, ngakhale abwino monga katundu makina a poliyesitala polyurethane, koma otsika kukhuthala zipangizo, zosavuta ndi isocyanate chigawo miscible zina, kwambiri processing ntchito.

polyols poliyesitala zambiri amatchedwa ndi asidi ndi dicarboxylic ndi glycol ndi zina poliyesitala polyol ndi condensation anachita. Monzama munali Ester gulu (COO) kapena carbonate gulu (OCOO) polyol. Polyurethane foams ankagwiritsa ntchito. Zofewa thovu zimagwiritsa ntchito zipangizo ndi magalimoto zipangizo zosiyanasiyana mphasa, zipangizo kutchinjiriza; okhwima thovu kutchinjiriza zimagwiritsa ntchito zoyendera magetsi banja, nyumba khoma kumatira kutsitsi thovu kutchinjiriza zipangizo chitoliro kutchinjiriza, mapanelo nyumba, magalimoto mufuriji ndi ozizira yosungirako kutchinjiriza ndi zipangizo zina; theka-okhwima thovu ntchito mapanelo magalimoto chida, chiwongolero ndi zina zotero. msika ali zosiyanasiyana specifications kwa polyurethane thovu kuphatikiza zipangizo (ziwiri zikuluzikulu premix), makamaka kwa (ozizira mankhwala) mkulu sichisinthasinthanso foams, foams theka-okhwima, akuponya ndi kupopera molimba thovu pulasitiki.

(Diethyl efa

1. Pamene osakaniza Mowa ndi kuikapo maganizo asidi sulfuric anaisonkhezera 140 ℃ akhoza intermolecular mankhwala madzi m'thupi ndi efa. moyikirapo sulfuric asidi monga nthumwi dehydrating kumene chothandizira.

2. aone kuti pali: 2 CH3-CH2-HA - catalyzed ndipo ankaganiza H2SO4 → pa 140 ℃ CH3-CH2-O-CH2-CH3 + H2O)

Polyurethane elastomer

Polyurethane elastomer ndi polyurethane gulu zinthu zosiyanasiyana, chifukwa cha matabwa ake ndi zigawo ziwiri zofewa ndi zovuta, angathe kutikonza kugawira zinthu maselo ndi mphamvu yapamwamba, kulimba, kuvala kukana, kukana mafuta ntchito kwambiri, onse ndi mphira ndi mkulu elasticity ndi chinthu chimodzimodzi pulasitiki, amatchedwa "kuvala zosagwira mphira."

     Polyurethane elastomer tsopano tikhoza kugwiritsa ntchito limodzi mphira mastication, kusakaniza, kuchiritsa ndondomeko akamaumba (amanena MPU); komanso kukhala ndi mphira madzi, ukaponye akamaumba kapena kupopera, kuponyera, centrifugal akamaumba (amatchula CPU); akhoza kukhala okonzeka ku pellets, ndipo, ngati wamba pulasitiki, jekeseni, extrusion, calendering, akamaumba nkhonya ndi njira zina (a CPU). Akamaumba kapena jekeseni kuumbidwa mbali mkati osiyanasiyana zina za kuuma, komanso akhoza kudula, akupera, kuboola ndi Machining ena. Processing zamitundumitundu, ndi polyurethane elastomer lonse applicability, ofunsira likupitiriza kuwonjezeka.

  Mafuta kukana, Mpweya umene kukana, okalamba kukana, cheza kukana, otsika kutentha, mandala zikumveka bwino, guluu wolimba amphamvu, biocompatibility kwambiri ndipo ngakhale magazi. ubwino ndi polyurethane elastomer chimagwiritsidwa ntchito ya usilikali, Azamlengalenga, zowulutsira, zamoyo ndi zifukwa zina.

The mwayi waukulu polyurethane elastomer:

    1, ntchitoyo osiyanasiyana chosinthika. chiwerengero cha thupi ndi makina zizindikiro ntchito zikhoza kusintha mwa kusankha zipangizo ndi formulations, mkati osiyanasiyana zina, kukwaniritsa ziyeneretso osiyana ntchito mankhwala. Monga kuuma, nthawi zambiri chizindikiro zofunika za ogwiritsa mankhwala a, onse anapanga polyurethane elastomer gombe A kuuma 20 kapena odzigudubuza zofewa kusindikiza komanso zoposa 70 gombe D kuuma zovuta mphira wodzigudubuza pakubwezeretsa, ichi ndi elastomeric ambiri zinthu zovuta kuchita. Polyurethane elastomer ndi kumalo ozizira polima zinthu wapangidwa ndi zigawo zambiri ndi zigawo molimba wapangidwa ndi unyolo kusintha, ndi bwino ndi kuchuluka kwa kumalo ozizira gulu kachulukidwe zovuta gawo chiwerengero cha mphamvu elastomer choyambirira ndi kuwumitsa udzakhala wautali mogwirizana.

    2, kuposa avale kukana. Makamaka kumene kuli madzi, mafuta wetting sing'anga zinthu zilipo ntchito, ndi avale kulimbana ndi maulendo angapo kuti kangapo wamba zipangizo mphira. zipangizo zachitsulo monga zitsulo, ngakhale kovuta koma osati kuvala, monga lalikulu mpope ulimi wothirira kudera la Mtsinje Yellow, ndi overcurrent chitetezo zigawo ndi pakamwa zitsulo mphete yodindira pambuyo kwambiri osefukira chitayiko, satenga mazana maora aakulu kuvala kutayikira, pamene ntchito polyurethane elastomer TACHIMATA pakamwa mphete ndi mphete chitetezo ndi mosalekeza opaleshoni 1800 mu yaing'ono koma kuvala. Ena, monga mpunga mphero ntchito mphira wodzigudubuza hulling makina, akututuma chophimba sieve Malasha Kukonzekera ndi njanji kusitediyamu msewu wonyamukira ndege wodalirika zisindikizo mafuta ntchito forklift Kireni pamalo gudumu ndi mawilo wodzigudubuza skates, etc. alinso polyurethane elastomer Iwo ubwera. Mu mfundo imeneyi Buku ndi anafunika kusintha koyefishienti wa mikangano ya otsika-kuuma polyurethane elastomer membala, kusintha kuvala kukana pansi zimakhudza katundu, inu mukhoza kuwonjezera pang'ono zotayidwa disulfide, graphite kapena mafuta silikoni ngati polyurethane elastomer, etc. lubricant.