Inkomba ye-viscosity ye-hydroxypropyl methylcellulose iyinkomba ebaluleke kakhulu. I-viscosity ayimeleli ubumsulwa. I-viscosity ye-cellulose HPMC incike enqubweni yokukhiqiza. Izindawo ezahlukene zokusebenzisa kufanele zikhethe i-cellulose HPMC ene-viscosities ehlukene, hhayi i-viscosity ephezulu ye-cellulose HPMC, kungcono! Okulungile kulungile!
1. Ukulawula ukujiya
I-hydroxypropyl methylcellulose ene-viscosity ephezulu ayikwazi ukukhiqiza i-cellulose ephezulu kakhulu kuphela ngokuyihlanza nge-vacuum kanye nokufaka esikhundleni se-nitrogen ekukhiqizeni. Ngokuvamile, ukukhiqizwa kwe-cellulose ene-viscosity ephezulu eShayina akunakulawulwa. Kodwa-ke, uma imitha yokulinganisa umoya-mpilo ingafakwa eketheni, ukukhiqizwa kwe-viscosity yayo kungalawulwa ngokwenziwa.
2. Ukusetshenziswa kwe-ejenti yenhlangano
Ngaphezu kwalokho, uma ucabangela ijubane lokufaka i-nitrogen esikhundleni, kulula ukukhiqiza imikhiqizo ene-viscosity ephezulu kungakhathaliseki ukuthi uhlelo lungena umoya kangakanani. Yiqiniso, izinga le-polymerization yekotini elicwengisisiwe nalo libalulekile. Uma lokho kungasebenzi, kwenze nge-hydrophobic association. Kukhona ama-association agents kule ndawo eShayina. Uhlobo luni lwe-association agent okufanele ulukhethe lunethonya elikhulu ekusebenzeni komkhiqizo wokugcina.
3. Okuqukethwe kwe-Hydroxypropyl
I-oxygen esele ku-reactor ibangela ukuwohloka kwe-cellulose kanye nokwehla kwesisindo sama-molecule, kodwa i-oxygen esele ilinganiselwe, uma nje ama-molecule aphukile ephinde axhunyaniswa kabusha, akunzima ukwenza i-viscosity ephezulu. Kodwa-ke, izinga lokugcwala lihlobene kakhulu nokuqukethwe kwe-hydroxypropyl. Amanye amafektri afuna kuphela ukunciphisa izindleko nentengo, kodwa awafuni ukwandisa okuqukethwe kwe-hydroxypropyl, ngakho ikhwalithi ayikwazi ukufinyelela ezingeni lemikhiqizo efanayo yangaphandle.
4. Ezinye izinto
Izinga lokugcina amanzi lomkhiqizo linobudlelwano obuhle ne-hydroxypropyl, kodwa kuyo yonke inqubo yokusabela, liphinde linqume izinga lokugcina amanzi, umphumela we-alkaliization, isilinganiso se-methyl chloride ne-propylene oxide, ukuhlushwa kwe-alkali kanye nokugcinwa kwamanzi. Isilinganiso sokotini ocolisisiwe sinquma ukusebenza komkhiqizo.
Isikhathi sokuthunyelwe: Ephreli-04-2023