Ngabe iphunga le-hydroxypropyl methylcellulose liyithinta kanjani ikhwalithi?

Iyini imiphumela yosayizi wephunga ku-hydroxypropyl methylcellulose:

Synthesis ofi-hydroxypropyl methylcellulose: Phatha i-cellulose kakotini ecolisisiwe nge-lye ku-35-40°C isigamu sehora, cindezela, uchoboze i-cellulose, futhi ubudala buguge kahle ku-35°C, ukuze izinga elimaphakathi le-polymerization ye-alkali etholiwe lingaphakathi kwezinhlanga ezidingekayo ngaphakathi. Faka i-alkali fibre eketelani le-etherification, engeza i-propylene oxide ne-methyl chloride ngokulandelana, futhi i-etherify ku-50-80°C amahora angu-5, ukucindezela okukhulu cishe ku-1.8MPa. Bese wengeza inani elifanele le-hydrochloric acid ne-oxalic acid emanzini ashisayo ku-90 ° C ukuze ugeze izinto zokwandisa ivolumu. Dehydrate in a centrifuge. Geza ngamanzi kuze kube yilapho ungathathi hlangothi. Uma umswakama wempahla ungaphansi kuka-60%, womise ngomoya oshisayo ogelezayo ku-130°C kuze kube yilapho umswakama ungaphansi kuka-5%.

I-HPMC ekhiqizwa indlela yokuncibilikisa isebenzisa i-toluene ne-isopropanol njengezincibilikisi. Uma ukuwashwa kungalungile, iphunga elithile elibuthakathaka liyosala. Njengamanje, ikhwalithi ye-hydroxypropyl methylcellulose HPMC yasekhaya iyahluka kakhulu, futhi intengo iyahluka kakhulu, okwenza kube nzima kumakhasimende ukwenza ukukhetha okufanele. Lena inkinga yenqubo yokugeza, ayithinti ukusetshenziswa futhi ayikho inkinga, i-HPMC ehlanzekile akufanele ihogele i-ammonia, isitashi notshwala; UphingileI-HPMCiyakwazi ukuhogela zonke izinhlobo zephunga, ngisho noma ingenambitheki, izozizwa isindayo. Kodwa-ke, i-hydroxypropyl methylcellulose ekhiqizwa abakhiqizi abaningi inephunga elinamandla kanye nephunga elimnandi. Ikhwalithi ngokuqinisekile ayikho ezingeni.

I-Hypromellose itholakala ngokufaka ukotini ocolisisiwe ngoketshezi oluyivelakancane ukuze kutholwe i-alkaline cellulose, bese yengeza i-solvent, i-etherification agent, i-toluene, ne-isopropanol yokusabela kwe-etherification, ukugeza okungathathi hlangothi, ukomisa, ukuchotshozwa, njll. Hhayi-ke, kuzoba nephunga, ngakho abasebenzisi bangalisebenzisa ngokuzethemba.