Imikhiqizo yochungechunge oluthambile lwe-polyurethane ikakhulukazi ihlanganisa i-block, eqhubekayo, isipontshi, igwebu eliqinile (i-HR), igwebu elizibambayo, igwebu eliqinile eliqinile, igwebu elincane kanye negwebu elimunca amandla eliqinile.Lolu hlobo lwegwebu lusabala cishe amaphesenti angama-50 engqikithi yomkhiqizo we-polyurethane.Kunezinhlobonhlobo zemikhiqizo futhi ububanzi bokusebenza bukhula njalo, futhi bebelokhu bebambe iqhaza emikhakheni ehlukahlukene yomnotho wezwe: izinto zikagesi zasendlini, izimoto, ukuthuthukiswa kwekhaya, ifenisha, izitimela, imikhumbi, i-aerospace neminye imikhakha eminingi.Selokhu kwavela igwebu elithambile le-PU ngeminyaka yawo-1950, ikakhulukazi ngemuva kokungena ekhulwini lama-21, ubuchwepheshe, izinhlobonhlobo, nokuphuma komkhiqizo konke kuye kwagxuma.Okugqamile kufaka phakathi: igwebu elithambile le-PU elihambisana nemvelo, okuyimikhiqizo ye-polyurethane eluhlaza;inani eliphansi le-VOC i-PU igwebu elithambile;i-atomization ephansi ye-PU igwebu elithambile;amanzi agcwele i-PU igwebu elithambile;uchungechunge olugcwele lwe-MDI igwebu elithambile;i-flame retardant, intuthu ephansi, igwebu eligcwele lochungechunge lwe-MDI;Izithasiselo ezintsha ezifana nama-polymer catalysts asebenzayo, ama-stabilizer, ama-flame retardants nama-antioxidants;ama-polyols ane-unsaturation ephansi kanye nokuqukethwe kwe-monoalcohol ephansi;I-ultra-low density PU flexible foam enezakhiwo ezinhle kakhulu zomzimba;imvamisa ye-resonance ephansi, igwebu elithambile le-PU elidlulisa kancane;polycarbonate diol, polye-caprolactone polyol, polybutadiene diol, polytetrahydrofuran nezinye polyols ezikhethekile;ubuchwepheshe obumanzi be-CO2 obugwebu, ubuchwepheshe obunamagwebu obucindezelayo, njll. Ngamafuphi, ukuvela kwezinhlobo ezintsha nobuchwepheshe obusha kukhuthaze ukuthuthukiswa okuqhubekayo kwegwebu elithambile le-PU.
Isimiso esinamagwebu
Ukuze uhlanganise igwebu elithambile le-PU elifanelekile elihlangabezana nezidingo, kuyadingeka ukuqonda umgomo wokusabela kwamakhemikhali wohlelo lwegwebu ukuze ukhethe izinto zokusetshenziswa eziyinhloko neziyisizayo nezinqubo zokukhiqiza.Ukuthuthukiswa kwemboni ye-polyurethane akusesona isiteji sokulingisa, kodwa kubonakala ngesakhiwo sempahla eluhlaza kanye nenqubo yokuhlanganisa ngokuvumelana nezidingo zokusebenza komkhiqizo wokugcina.Igwebu le-polyurethane libamba iqhaza ekushintsheni kwamakhemikhali phakathi nenqubo yokuhlanganiswa, futhi izici ezithinta izakhiwo ze-foam ziyinkimbinkimbi, azibandakanyi nje ukusabela kwamakhemikhali kwe-isocyanate, i-polyether (ester) utshwala namanzi, kodwa futhi ne-colloid chemistry of foaming.Ukusabela kwamakhemikhali kuhlanganisa ukunwetshwa kweketango, ukukhihliza amagwebu nokuxhumanisa.Kuphinde kuthinte isakhiwo, umsebenzi kanye nesisindo samangqamuzana ezinto ezihilelekile ekuphenduleni.Ukusabela okujwayelekile kokuhlanganiswa kwe-polyurethane foam kungavezwa ngefomula elandelayo:
Isikhathi sokuthumela: Sep-06-2022