Kwihlabathi lokuveliswa kwe-polyurethane foam, ii-catalysts zidlala indima ebalulekileyo ekumiseleni iipropati kunye nomgangatho wemveliso yokugqibela. Enye yezi catalyst yi-BDMAEE (Bis(dimethylaminoethyl) ether), i-amine esebenzayo kakhulu eyaziwayo ngempembelelo yayo ebalulekileyo kwinkqubo yokufutha kwiinkqubo ze-polyurethane. Eli nqaku liza kujonga indlela esebenza ngayo ii-catalysts ze-amine, ligxile kakhulu kwi-BDMAEE, kwaye lichaze indlela ezi catalysts ezichaphazela ngayo ukuveliswa kwee-foams ze-polyurethane eziguquguqukayo.
Indlela Yokusebenza yeIi-Amine Catalystskwimveliso yePolyurethane
Imveliso ye-polyurethane foam ixhomekeke kwi-chemical reaction phakathi kwe-isocyanates kunye ne-polyols. Le reaction inokwahlulwa ibe ziinkqubo ezimbini eziphambili: i-"foaming" reaction kunye ne-"gelation". I-foaming reaction yenzeka phakathi kwe-isocyanates kunye namanzi, nto leyo ebangela ukuveliswa kwe-carbon dioxide, edala ulwakhiwo lweseli lwe-foam. I-gelation reaction, kwelinye icala, ibandakanya i-reaction phakathi kwe-isocyanates kunye ne-polyols, nto leyo ekhokelela ekwakhiweni kwenethiwekhi ye-polymer enika i-foam ubume bayo.
Ii-amine catalysts ezifana ne-BDMAEE zisetyenziswa kakhulu ukukhawulezisa ukusabela kwe-foam. Zisebenza ngokunyusa isantya apho ii-isocyanates zisabela khona namanzi, nto leyo ekhokelela ekukhutshweni ngokukhawuleza kwe-carbon dioxide. Oku kukhawulezisa kubalulekile ekuqinisekiseni ukuba i-foam iphuhlisa isakhiwo seseli esifunekayo ngaphambi kokuba inethiwekhi ye-polymer iseti, ebeya kuthi ngenye indlela ibambe igesi kwaye yonakalise umgangatho we-foam.
I-BDMAEE: Isihluthulelo esiPhambili seFoams zePolyurethane eziguquguqukayo
I-BDMAEE ixatyiswa kakhulu ekuvelisweni kweefoam ze-polyurethane eziguquguqukayo, ezisetyenziswa kakhulu kwiintlobo ngeentlobo zezixhobo, ukusuka kwifenitshala kunye nezihlalo zeemoto ukuya ekugqumeni nasekupakisheni. Isiphumo sayo esinamandla sokutsala amandla kwimpendulo yefoam siyenza ibe lukhetho olukhethwayo kule meko. Umsebenzi ophezulu we-BDMAEE uqinisekisa ukuba ifoam ifikelela kulwandiso olufunekayo kunye nolwakhiwo olufanayo lweseli, olubaluleke kakhulu ekusebenzeni kweefoam eziguquguqukayo.
Nangona kunjalo, isiphumo esinamandla sokutsala amandla se-BDMAEE kufuneka silinganiswe ngononophelo ukuze kuthintelwe ukukhawuleziswa okugqithisileyo, okunokukhokelela kwiziphene kwi-foam, njengezakhiwo ezinkulu okanye ezingaqhelekanga zeeseli. Olu lungelelwaniso ludla ngokufezekiswa ngokudibanisa i-BDMAEE nezinye izongezo okanye ukulungisa indlela yokwenza ukuze kulungiswe izinga lokuphendula kunye nokufezekisa iimpawu ze-foam ezifunekayo.
Ngamafutshane, i-BDMAEE yinkqubo evuthiweyo nesebenzayoisikhuthaziukuze kuveliswe amagwebu e-polyurethane aguquguqukayo. Indima yayo ekukhawuleziseni ukusabela kwegwebu ibaluleke kakhulu ekudaleni iimveliso zegwebu ezisemgangathweni ophezulu nezihambelanayo. Ukuqonda indlela esebenza ngayo kuvumela abavelisi ukuba baphucule iinkqubo zabo kwaye bafumane iziphumo ezilungileyo kakhulu kwimveliso yegwebu le-polyurethane.
Ixesha lokuthumela: Agasti-12-2024