Ngokuvamile, ekuhlanganisweni kwehydroxypropyl methylcellulose, i-cotton cotton cotton ephethwe ngesisombululo se-alkali ku-35- 40 ° C isigamu sesigamu sehora, incishisiwe, i-cellulose isuka kuma-alkali fibers ayi-35 ° C, ukuze ama-Alkali Fibers angama-35 ° C, ukuze ama-alkali atholakele ama-polymerized degree adingekayo ububanzi. Beka i-alkali fiber ku-kettle yokuthethelwa, engeza i-propelene oxide kanye ne-methyl chloride futhi, futhi uthele ku-50-80 ℃ amahora angu-5 kuya kungcindezi ephezulu ye-1.8 MPA. Ngemuva kwalokho engeza inani elifanele le-hydrochloric acid ne-acid oxalic emanzini ashisayo ku-90 ° C ukugeza okuqukethwe ukwandisa ivolumu. Dohydrate nge-centrifuge. Geza kuze kungathathi hlangothi, lapho okuqukethwe kwamanzi okuqukethwe kungaphansi kwama-60%, komisa ngokugeleza komoya okushisayo ku-130 ° C kuya ngaphansi kwama-5%.
I-Alkalization: Ukotini ocwengekile ocwengekile ngemuva kokuvulwa kwengezwa ku-solvent ye-inert kanye namanzi athambile ukuvuvukala ukungena kwekotini okucwengekileyo, okuvumela ukuqunjelwa kokuphendula kwe-ejenti . I-alkali esetshenziswe ku-alkalization yi-metal hydroxide noma isisekelo se-organic. Inani le-alkali elingeziwe (ngesisindo, okufanayo ngezansi) liyi-0.1-0.6 izikhathi zekotini ezicwengiwe, kanye nenani lamanzi athambile alokhokhokho ka-0.3-1.0 elokotini elicwengekile; I-solvent ye-inert iyingxube yotshwala ne-hydrocarbon, futhi inani le-solvent ye-inert solvent elengeziwe likotini. Izikhathi eziyi-7-15: I-solvent ye-inert nayo ingaba utshwala ngama-athomu wekhabhoni angama-3-5 (njengotshwala, i-propapol), i-acetone. Kungaba futhi nama-hydrocarbon a-aliphatic kanye nama-hydrocarbons amnandi; Izinga lokushisa kufanele lilawulwe ngaphakathi kwe-0-35 ° C ngesikhathi sokuhlangana; Isikhathi se-alkalization sicishe nge-1hr. Ukulungiswa kwamazinga okushisa nesikhathi kunganqunywa ngokuya ngezidingo zezinto ezibonakalayo nomkhiqizo.
Ukuthembela: Ngemuva kokwelashwa kwe-alkalization, ngaphansi kwezimo ze-vacuum, ukusheshisa kwenziwa ngokungeza umenzeli othembisayo, futhi umenzeli otherizayo yi-propenene oxide. Ukuze anciphise ukusetshenziswa kwe-ejenti etheriphule, i-ejenti etherati yengezwa kabili ngesikhathi senqubo yokusheshisa.
Isikhathi Seposi: APR-28-2024