Ngabe iphunga le-hydroxypropyl methylcellulose (HPMC) liyithinta kanjani ikhwalithi?

Indlela yokunquma ikhwalithi ye-hydroxypropyl methylcellulose (HPMC) umbuzo amakhasimende amaningi nabangane abakhathazeke kakhulu ngawo. Namuhla, i-Xinhe Shanda Cellulose ifingqa indlela yokwahlulela ikhwalithi ye-hydroxypropyl methylcellulose (HPMC) Uma kubhekwa ikhwalithi yomkhiqizo:

Okokuqala, sidinga ukuqonda inqubo yokukhiqiza i-hydroxypropyl methylcellulose:

IHydroxypropyl methylcellulose, eyaziwa nangokuthi i-hypromellose kanyei-cellulose hydroxypropyl methyl ether, yenziwe nge-cotton cellulose ehlanzekile kakhulu njengento eluhlaza, efakwe ngokukhethekile etherified ngaphansi kwezimo ze-alkali.

Ukwenziwa kwe-hydroxypropyl methylcellulose: phatha i-cotton cellulose ecolisisiwe nge-lye ku-35-40°C isigamu sehora, yicindezele, uchoboze i-cellulose, futhi uyiguge kahle ku-35°C ukuze wenze isilinganiso sezinga le-polymerization ye-alkali etholiwe. i-fiber ngaphakathi kwebanga elifunayo. 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 kuze kube yilapho ungathathi hlangothi, futhi lapho okuqukethwe kwamanzi kumpahla kungaphansi kuka-60%, yomise ngokugeleza komoya oshisayo ku-130 ° C kuya kokuqukethwe okungaphansi kuka-5%.

I-HPMC ekhiqizwa indlela yokuncibilikisa isebenzisa i-toluene ne-isopropanol njengezincibilikisi. Uma ukuwashwa kungalungile, kuzoba nephunga elincanyana eliyinsalela. Lokhu kuyinkinga ngenqubo yokugeza, futhi akuthinti ukusetshenziswa futhi akukho nkinga, kodwa empeleni I-hydroxypropyl methylcellulose ekhiqizwa abakhiqizi abaningi inephunga elinamandla ikakhulukazi kanye nephunga elimnandi. Izinga lalolu hlobo nakanjani alikho ezingeni.

I-Hypromellose ukotini ocolisisiwe ofakwe uketshezi oluyivelakancane ukuze kutholwe i-alkaline cellulose, bese wengeza i-solvent, i-etherification agent, i-toluene, ne-isopropanol ukuze uphendule i-etherification, futhi uthole umkhiqizo ophelile ngemva kokungathathi hlangothi, ukuwashwa, ukomiswa nokuchotshozwa. Ayilungile, izonuka, ngakho abasebenzisi bangayisebenzisa ngokuzethemba.