Iifoam eziguquguqukayo zepolyurethane zizinto ezinokusetyenziswa ngeendlela ezahlukeneyo, ukusuka kwifenitshala ukuya kwiindawo zokuhlala zeemoto. Ukusebenza kwezi foam kuchaphazeleka kakhulu kukukhethwa kwee-catalysts, ezilawula iimpendulo eziphambili zeekhemikhali ngexesha lokwenziwa kwefoam. Phakathi kweempendulo ezibalulekileyo ezibandakanyekayo kukusabela kwe-gelation (ukwakheka kwee-carbamates) kunye nokusabela kwe-foam (impendulo phakathi kwamanzi kunye ne-isocyanates, evelisa i-urea kunye negesi). Ezi mpendulo kufuneka zilinganiswe ngononophelo ukuze kudalwe isakhiwo sefoam esifunekayo, nokuba seseseli evulekileyo okanye esivaliweyo.
Isincedisi seFoams eziguquguqukayo:I-MXC-A1 (BDMAEE)
I-MXC-A1, eyaziwa ngokwekhemikhali njenge-N,N,N',N'-tetramethyl-2,2′-oxybis (ethylamine), yenye yezona catalysts zisebenzayo ze-tertiary amine ezisetyenziswa kwimveliso ye-polyurethane foam eguquguqukayo. Lulwelo olungenambala ukuya kolutyheli kancinci olunomsebenzi ophezulu kakhulu we-catalytic kunye nokukhetha impendulo ye-foam.I-MXC-A1Ikhuthaza kakhulu impendulo ye-urea (impendulo ye-water-isocyanate), ebalulekileyo ekwenzeni amagwebu e-polyurethane athambileyo naqinileyo.
Iimpendulo eziphambili kwimveliso yefoam zingahlulwahlulwa zibe:
- Impendulo yeGelation:Ukwakheka kwee-carbamates ngokusabela ii-isocyanates kunye namaqela e-hydroxyl (-OH) kwii-polyols.
- Impendulo Ekhupha Igwebu:Ukusabela kwee-isocyanates ngamanzi, okukhokelela ekwakhiweni kwee-urea kunye neebhamu zegesi ezandisa isakhiwo se-foam.
Ukulinganisela i-Gelation kunye neempendulo ze-Foaming
Impumelelo yesakhiwo sefoam eguquguqukayo—nokuba yi-open-cell (evumela ukuhamba komoya) okanye i-closed-cell (ebonelela ngobushushu obungcono)—ixhomekeke kwibhalansi phakathi kwe-gelation rate kunye ne-gas expansion rate. Le balance ilawulwa ngokulungelelanisa uhlobo kunye nobungakanani be-catalysts kunye ne-foam stabilizers kwi-formulation.
I-MXC-A1 ifanelekile ngokukodwa kwizicelo zefoam ezihlala ixesha elide (HR) kunye nokubumba i-reaction injection (RIM) ngenxa yokuba ikwazi ukukhawulezisa i-foam reaction ngelixa igcina ulawulo olwaneleyo kwinkqubo ye-gelation. Ngokulawula uxinano lwe-catalyst, abavelisi banokwenza ngcono ibhalansi phakathi kokwakheka kwegesi kunye nokuqina kwesakhiwo sefoam.
Ukusetyenziswa kweMXC-A1 kwiFlexible Foam
I-MXC-A1 inezicelo ezininzi ekuveliseni phantse zonke iintlobo zeefoam ze-polyurethane, nangona ukusebenza kwayo okuphezulu kunye nokusebenza kakuhle kwenza ukuba ifaneleke ngakumbi kwiimveliso zefoam ethambileyo. Kwiifoam eziqinileyo, ezifana nezo zisetyenziswa kwizihlalo zeemoto kunye neekhushini zefenitshala, i-MXC-A1 iqinisekisa ulwakhiwo lweseli olufanayo kwaye iphucula ukuqina kunye nentuthuzelo yefoam. Ikwasetyenziswa rhoqo kwiimveliso ze-RIM apho iifoam eziguquguqukayo kufuneka zihlangabezane neempawu zoomatshini nezomzimba ezifunekayo.
Ukuqukumbela, ii-catalysts ze-polyurethane ezifana ne-MXC-A1 zidlala indima ebalulekileyo ekufezekiseni iimpawu zokusebenza ezifunekayo ze-foams eziguquguqukayo. Ngokukhuthaza i-reactions ye-foam ebalulekileyo kunye ne-gelation, zivumela abavelisi ukuba balungelelanise ulwakhiwo lwe-foam, ukuqina, kunye nozinzo kwiimfuno ezithile zesicelo.
Ixesha leposi: Jan-13-2025