Nigute impumuro ya hydroxypropyl methylcellulose (HPMC) igira ingaruka kumiterere?

Nigute ushobora kumenya ubwiza bwa hydroxypropyl methylcellulose (HPMC) nikibazo abakiriya benshi ninshuti bahangayikishijwe cyane. Uyu munsi, Xinhe Shanda Cellulose avuga muri make uburyo bwo gusuzuma ubuziranenge bwa hydroxypropyl methylcellulose (HPMC) Ukurikije ubuziranenge bwibicuruzwa:

Mbere ya byose, dukeneye gusobanukirwa inzira yumusaruro wa hydroxypropyl methylcellulose:

Hydroxypropyl methylcellulose, izwi kandi nka hypromellose naselile hydroxypropyl methyl ether, ikozwe muri pamba selulose isukuye cyane nkibikoresho fatizo, ikaba idasanzwe cyane muri alkaline.

Synthesis ya hydroxypropyl methylcellulose: kuvura selile nziza ya selile hamwe na lye kuri 35-40 ° C mugihe cyigice cyisaha, kuyikanda, kumenagura selile, no kuyisaza neza kuri 35 ° C kugirango ugereranye impuzandengo ya polymerisation ya alkali yabonetse. fibre murwego rwifuzwa. Shira fibre ya alkali mumasafuriya ya etherification, ongeramo okiside ya propylene na methyl chloride ikurikiranye, hanyuma etherify kuri 50-80 ° C mumasaha 5, umuvuduko ntarengwa ni 1.8MPa. Noneho shyiramo urugero rwa acide hydrochloric na aside oxyde mumazi ashyushye kuri 90 ° C kugirango woze ibikoresho kugirango wagure amajwi. Umwuma muri centrifuge. Karaba kugeza utabogamye, kandi mugihe amazi arimo mubikoresho ari munsi ya 60%, yumisha hamwe numwuka ushushe kuri 130 ° C kugeza kubiri munsi ya 5%.

HPMC yakozwe nuburyo bwo gukemura ikoresha toluene na isopropanol nkibishishwa. Niba gukaraba atari byiza, hazabaho umunuko usigaye. Iki nikibazo cyo gukaraba, kandi ntabwo bigira ingaruka kumikoreshereze kandi ntakibazo gihari, ariko mubyukuri hydroxypropyl methylcellulose yakozwe nababikora benshi ifite impumuro ikomeye cyane numunuko ukaze. Ubwiza bwubu bwoko ntabwo rwose bugera kubisanzwe.

Hypromellose itunganijwe neza ipamba yatewe mumazi adasanzwe kugirango ibone selile ya alkaline, hanyuma wongereho solvent, etherification agent, toluene, na isopropanol kugirango reaction ya etherification, hanyuma ubone ibicuruzwa byarangiye nyuma yo kutabogama, gukaraba, gukama, no kumenagura. Ntabwo aribyiza, bizahumura, kubakoresha rero barashobora kubikoresha bafite ikizere.