Litlamorao tsa boholo ba monko ho hydroxypropyl methylcellulose ke life:
Ho kopanngoa hahydroxypropyl methylcellulose: Tšoara cellulose ea k'hothone e hloekisitsoeng ka lye ho 35-40°C ka halofo ea hora, tobetsa, sila cellulose, 'me u tsofale hantle ho 35°C, e le hore tekanyo e tloaelehileng ea polymerization ea alkali e fumanoeng e be ka har'a tekanyo e hlokahalang ea likhoele tse ka hare. Kenya faeba ea alkali ka ketleleng ea etherification, eketsa propylene oxide le methyl chloride ka tatellano, 'me u etherify ho 50-80°C ka lihora tse 5, khatello e phahameng ka ho fetisisa ke hoo e ka bang 1.8MPa. Ebe u eketsa bongata bo loketseng ba hydrochloric acid le oxalic acid metsing a chesang ho 90°C ho hlatsoa thepa ho eketsa bophahamo. E ntše metsi ka har'a centrifuge. Hlatsoa ka metsi ho fihlela e sa nke lehlakore. Ha mongobo oa thepa o le tlase ho 60%, e omise ka moea o chesang ho 130°C ho fihlela mongobo o le tlase ho 5%.
HPMC e hlahisoang ke mokhoa oa ho qhibilihisa e sebelisa toluene le isopropanol e le li-solvent. Haeba ho hlatsoa ho se monate, monko o fokolang o tla sala. Hona joale, boleng ba hydroxypropyl methylcellulose ea lapeng HPMC bo fapana haholo, 'me theko e fapana haholo, e leng se etsang hore ho be thata hore bareki ba etse khetho e nepahetseng. Ena ke bothata ba mokhoa oa ho hlatsoa, ha bo ame tšebeliso 'me ha ho na bothata, HPMC e hloekileng ha ea lokela ho nkha ammonia, starch le joala; E kopantsoe.HPMChangata e ka fofonela mefuta yohle ya menko, leha e se na tatso, e tla utlwahala e le boima. Leha ho le jwalo, hydroxypropyl methylcellulose e hlahiswang ke bahlahisi ba bangata e na le monko o matla haholo le monko o bohale. Boleng ba yona ha bo fihlellehe.
Hypromellose e fumanoa ka ho tšela k'hothone e hloekisitsoeng ka mokelikeli o sa tloaelehang ho fumana alkaline cellulose, ebe ho eketsoa solvent, enterification agent, toluene, le isopropanol bakeng sa karabelo ea etherification, ho fokotsa ho hlatsoa, ho omisa, ho sila, jj. ho fumana lihlahisoa tse felileng. Ho tla ba le monko o monate, kahoo basebelisi ba ka o sebelisa ka kholiseho.
Nako ea poso: Mmesa-25-2024