Monko oa hydroxypropyl methylcellulose (HPMC) o ama boleng joang?

Mokhoa oa ho tseba boleng ba hydroxypropyl methylcellulose (HPMC) ke potso eo bareki le metsoalle ba bangata ba amehileng ka eona. Kajeno, Xinhe Shanda Cellulose e akaretsa mokhoa oa ho ahlola boleng ba hydroxypropyl methylcellulose (HPMC) Ho ahlola boleng ba sehlahisoa:

Pele ho tsohle, re hloka ho utloisisa ts'ebetso ea tlhahiso ea hydroxypropyl methylcellulose:

Hydroxypropyl methylcellulose, e tsejoang hape e le hypromellose lecellulose hydroxypropyl methyl ether, e entsoe ka selulose ea k'hothone e hloekileng haholo e le lisebelisoa tse tala, tse nang le etherified ka ho khetheha tlas'a maemo a alkaline.

Tšimoloho ea hydroxypropyl methylcellulose: tšoara cellulose e hloekisitsoeng ea k'hothone ka lye ka 35-40 ° C ka halofo ea hora, e hatelle, e silakanya selulose, 'me e tsofale hantle ho 35 ° C ho etsa tekanyo e tloaelehileng ea polymerization ea alkali e fumanoeng. fiber ka har'a mefuta e lakatsehang. 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 ho fihlela u sa nke lehlakore, 'me ha metsi a ka har'a thepa a le tlase ho 60%, o omise ka moea o chesang oa moea o chesang ho 130 ° C ho ea ka tlase 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, ho tla ba le monko o fokolang. Ena ke bothata ka mokhoa oa ho hlatsoa, ​​​​'me ha o ame ho sebelisoa ebile ha ho na bothata, empa ha e le hantle Hydroxypropyl methylcellulose e hlahisoang ke bahlahisi ba bangata e na le monko o matla ka ho khetheha le monko o monate. Ka sebele boleng ba mofuta ona ha bo finyelle maemo.

Hypromellose ke k'hothone e hloekisitsoeng e kenngoeng ka mokelikeli o sa tloaelehang ho fumana selulose ea alkaline, ebe o eketsa solvent, etherification agent, toluene, le isopropanol bakeng sa karabelo ea etherification, 'me u fumane sehlahisoa se felileng ka mor'a ho se nke lehlakore, ho hlatsoa, ​​ho omisa le ho senya. Ha e ntle, e tla fofonela, kahoo basebelisi ba ka e sebelisa ka kholiseho.