Umahluko phakathi kwe-polyurethane MDI kunye neenkqubo ze-TDI zoomatshini be-elastomer
Intshayelelo:
Oomatshini be-polyurethane elastomer badlala indima ebalulekileyo kwishishini lanamhlanje.Nangona kunjalo, xa kuziwa ekukhetheni inkqubo ye-polyurethane, kukho iindlela ezimbini eziphambili: inkqubo ye-MDI (diphenylmethane diisocyanate) kunye ne-TDI (terephthalate).Eli nqaku liza kuphonononga umahluko phakathi kwezi nkqubo zimbini ukunceda umfundi enze ukhetho olunolwazi lwesicelo esithile.
I. Oomatshini be-Elastomer be-Polyurethane MDI Systems
Inkcazo kunye noKubunjwa: inkqubo ye-MDI yi-polyurethane elastomer eyenziwe kwi-diphenylmethane diisocyanate njengeyona nto iphambili ye-raw, ehlala iqulethe izinto ezincedisayo ezifana ne-polyether polyol kunye ne-polyester polyol.
Iimpawu kunye neeNzuzo:
Amandla aphezulu kunye nokuxhathisa kwe-abrasion: I-elastomers zenkqubo ye-MDI zineempawu ezibalaseleyo zomzimba kwaye zigcina uzinzo kwiindawo zoxinzelelo oluphezulu.
Ukuchasana nokuguga okugqwesileyo: ii-elastomers ezineenkqubo ze-MDI zinokuxhathisa okulungileyo kwi-oxidation kunye nemitha ye-UV kunye nobomi obude benkonzo.
Ukuchasana kakuhle kweoli kunye ne-solvents: I-elastomers ze-MDI zihlala zizinzile xa zibonakaliswe kwiikhemikhali ezifana namafutha kunye ne-solvents.
Imimandla yesicelo: Ii-elastomers zenkqubo ye-MDI zisetyenziswa ngokubanzi kwimveliso yeemoto, izixhobo zemidlalo kunye neemveliso zoshishino.
II.Polyurethane TDI oomatshini elastomer inkqubo
Inkcazo kunye nokwakheka: Inkqubo ye-TDI yi-polyurethane elastomer eyenziwe nge-terephthalate njengeyona nto iphambili, ehlala iqulethe izinto ezincedisayo ezifana ne-polyether polyol kunye ne-polyester polyol.
Iimpawu kunye nezinto eziluncedo:
I-elasticity elungileyo kunye nokuthamba: ii-elastomers zenkqubo ye-TDI zinokuthamba okuphezulu kunye nokuthamba kwaye zilungele iimveliso ezifuna ukuva kwesandla okuphezulu.
Ukusebenza okugqwesileyo okuphantsi kobushushu: Iilastomers zenkqubo ye-TDI zisenentsebenzo egqwesileyo yokugoba kwindawo ezinobushushu obuphantsi, kwaye akukho lula ukuzikhubaza okanye ukophuka.
Ifanele iimilo ezintsonkothileyo: ii-elastomers ze-TDI ziyagqwesa ekwenziweni kweemilo ezintsonkothileyo ukuhlangabezana neemfuno zoyilo ezahlukeneyo.
Usetyenziso: I-TDI elastomers zisetyenziswa kakhulu kwifanitshala kunye noomatrasi, ukwenziwa kwezihlangu kunye nemathiriyeli yokupakisha.
III.Ukuthelekiswa kwe-MDI kunye neenkqubo ze-TDI
Kwintsimi yoomatshini be-polyurethane elastomer, iinkqubo ze-MDI kunye ne-TDI zineempawu ezahlukeneyo kunye neenzuzo.Ezi theyibhile zilandelayo ziya kuphinda zithelekise iiyantlukwano ngokubhekiselele kwisakhiwo sekhemikhali, iipropati ezibonakalayo, ukhuseleko lokusingqongileyo kunye nokhuseleko, iindleko zemveliso kunye neendawo zokusetyenziswa:
| into yokuthelekisa | Inkqubo ye-MDI yePolyurethane | Inkqubo ye-polyurethane TDI |
| ubume beekhemikhali | Ukusebenzisa i-diphenylmethane diisocyanate njengeyona nto iphambili ekrwada | Ukusebenzisa i-terephthalate njengeyona nto iphambili ekrwada |
| Iimpawu zokuphendula | Iqondo eliphezulu lokunqumlana | ngaphantsi cross-linked |
| iimpawu zomzimba | - Amandla aphezulu kunye nokumelana nokunxiba | -i-elasticity entle kunye nokuthamba |
| -Ukumelana nokuguga okugqwesileyo | - Ukusebenza ngokugoba okugqwesileyo kubushushu obuphantsi | |
| - Ioli elungileyo kunye nokumelana ne-solvent | - Ifanelekile kwiimveliso ezinemilo enzima | |
| Ukhuseleko lokusingqongileyo kunye nokhuseleko | umxholo we-isocyanate ophantsi | umxholo ophezulu we-isocyanate |
| Iindleko zemveliso | ixabiso eliphezulu | ixabiso eliphantsi |
| Indawo yosetyenziso | - umenzi wemoto | - ifenitshala kunye noomatrasi |
| - Izixhobo zeMidlalo | - Ukwenziwa kwezihlangu | |
| - Iimveliso zoshishino | - Izinto zokuPakisha |
Njengoko kunokubonwa kwitheyibhile engentla, i-elastomers yenkqubo ye-polyurethane ye-MDI inamandla amakhulu, ukumelana nokuguga kunye nokumelana neoli, kwaye ifanelekile ukusetyenziswa kwimveliso yeemoto, izixhobo zemidlalo kunye neemveliso zoshishino.Kwelinye icala, ii-elastomers ze-polyurethane TDI zine-elastomer elungileyo, ukuguquguquka kunye neempawu zokugoba ezinobushushu obuphantsi, kwaye zifanelekile ukusetyenziswa kwiindawo ezinjengefenitshala kunye noomatrasi, ukwenziwa kwezihlangu kunye nezinto zokupakisha.
Kwakhona kubalulekile ukuqaphela ukuba inkqubo ye-MDI ibiza kakhulu ukuvelisa, kodwa inika ukhuseleko olungcono lokusingqongileyo kunye nokhuseleko.Ngokwahlukileyo, inkqubo ye-TDI inexabiso eliphantsi lokuvelisa kodwa umxholo we-isocyanate ophezulu kwaye ayihambelani kancinci nokusingqongileyo kunenkqubo ye-MDI.Ngoko ke, xa ukhetha inkqubo ye-polyurethane, abavelisi kufuneka baqwalasele ukusebenza kwemveliso, iimfuno zokusingqongileyo kunye nezithintelo zebhajethi ukwenzela ukuphuhlisa eyona nkqubo yokuvelisa ifanelekileyo ukuhlangabezana neemfuno zezicelo ezahlukeneyo.
IV.Iinketho zeSicelo kunye neeNgcebiso
Ukukhetha inkqubo efanelekileyo yezicelo ezahlukeneyo: Ukuqwalasela iimfuno zemveliso kunye neempawu zendawo yesicelo, ukukhetha i-elastomers kunye ne-MDI okanye iinkqubo ze-TDI ziqinisekisa ukusebenza kakuhle kunye neendleko ezifanelekileyo.
Ukwenziwa kwezigqibo malunga nokusebenza kwemveliso kunye nohlahlo lwabiwo-mali: xa ukhetha inkqubo, ukusebenza kwemveliso, iimfuno zokusingqongileyo kunye nezithintelo zohlahlo lwabiwo-mali zithathelwa ingqalelo ukuphuhlisa isisombululo semveliso esifanelekileyo.
Isiphelo:
I-Polyurethane MDI kunye ne-TDI inkqubo ye-elastomers nganye ineenzuzo zayo kwaye ifanelekile kwiimfuno zemveliso kwiindawo ezahlukeneyo.Ukuqonda umahluko kuya kunceda abavelisi benze ukhetho olunolwazi ukuqinisekisa ukuba iimveliso zabo zisebenza kakuhle kwizicelo ezithile.
Ixesha lokuposa: Aug-01-2023