Monko oa hydroxypropyl methylcellulose o ama boleng joang?

Litlamorao tsa boholo ba monko ho hydroxypropyl methylcellulose ke life:

Synthesis eahydroxypropyl methylcellulose: Tšoara selulose e hloekisitsoeng ea k'hothone ka lye ka 35-40 ° C ka halofo ea hora, tobetsa, senya selulose, 'me u tsohe hantle ka 35 ° C, e le hore tekanyo e tloaelehileng ea polymerization ea alkali e fumanoeng e ka har'a likhoele tse hlokahalang ka hare. Kenya fiber ea alkali ka har'a kettle ea etherification, eketsa propylene oxide le methyl chloride ka tatellano, 'me etherify ho 50-80 ° C bakeng sa lihora tse 5, khatello e phahameng e ka ba 1.8MPa. Ebe u eketsa tekanyo e loketseng ea hydrochloric acid le oxalic acid ho metsi a chesang a 90 ° C ho hlatsoa thepa ho atolosa molumo. Dehydrate ka centrifuge. Hlatsoa ka metsi ho fihlela u sa nke lehlakore. Ha mongobo oa thepa o le tlase ho 60%, o omise ka moea o chesang oa moea o chesang ho 130 ° C ho fihlela mongobo o ka tlaase ho 5%.

HPMC e hlahisoang ke mokhoa oa ho qhibiliha o sebelisa toluene le isopropanol e le li-solvents. Haeba ho hlatsuoa ho sa loka, monko o itseng o fokolang o tla sala. Hajoale, boleng ba lehae la hydroxypropyl methylcellulose HPMC bo fapana haholo, 'me theko e fapana haholo, e etsa hore ho be thata ho bareki ho etsa khetho e nepahetseng. Ena ke bothata ba mokhoa oa ho hlatsoa, ​​​​ha o ame ho sebelisoa ebile ha ho na bothata, HPMC e hloekileng ha ea lokela ho fofonela ammonia, starch le joala; SefebitsoeHPMChangata e ka fofonela mefuta eohle ea menko, le haeba e sa latsoehe, e tla utloa e le boima. Leha ho le joalo, hydroxypropyl methylcellulose e hlahisoang ke bahlahisi ba bangata e na le monko o matla haholo le monko o monate. Ka sebele boleng ha bo lekane.

Hypromellose e fumanoa ka ho kenya k'hothone e hloekisitsoeng ka mokelikeli o sa tloaelehang ho fumana selulose ea alkaline, ebe o eketsa solvent, etherification agent, toluene, le isopropanol bakeng sa karabelo ea etherification, ho hlapa, ho omisa, ho senya, joalo-joalo ho fumana lihlahisoa tse felileng. Hantle, ho tla ba le monko, kahoo basebelisi ba ka e sebelisa ka kholiseho.