I-MC iyi-methyl cellulose, eyenziwe nge-cellulose ether ngokwelapha ukotini ocwengekile nge-alkali, kusetshenziswa i-methane chloride njenge-etherification agent, futhi idlula ochungechungeni lwezimpendulo. Ngokuvamile, izinga lokushintsha liyi-1.6 ~ 2.0, kanti ukuncibilika nakho kuhlukile ngamazinga ahlukene okushintsha. Ingeye-non-ionic cellulose ether.
(1) Ukugcinwa kwamanzi kwe-methyl cellulose kuncike enanini layo lokwengeza, i-viscosity, ubuncane bezinhlayiya kanye nezinga lokuncibilika. Ngokuvamile, uma inani lokwengeza likhulu, ubuncane buncane, kanti i-viscosity inkulu, izinga lokugcinwa kwamanzi liphezulu. Phakathi kwazo, inani lokwengeza linomthelela omkhulu kakhulu esilinganisweni sokugcinwa kwamanzi, futhi izinga le-viscosity alilingani ngqo nezinga lezinga lokugcinwa kwamanzi. Izinga lokuncibilika lincike kakhulu ezingeni lokuguqulwa kobuso bezinhlayiya ze-cellulose kanye nobuncane bezinhlayiya. Phakathi kwama-ether e-cellulose angenhla, i-methyl cellulose kanye ne-hydroxypropyl methyl cellulose zinamazinga aphezulu okugcinwa kwamanzi.
(2) I-Methylcellulose iyancibilika emanzini abandayo, futhi kuzoba nzima ukuyincibilika emanzini ashisayo. Isixazululo sayo samanzi sizinzile kakhulu ebangeni le-pH=3~12. Ihambisana kahle nesitashi, i-guar gum, njll. kanye nama-surfactants amaningi. Lapho izinga lokushisa lifinyelela izinga lokushisa le-gelation, kwenzeka i-gelation.
(3) Izinguquko ekushiseni zizothinta kakhulu izinga lokugcina amanzi le-methyl cellulose. Ngokuvamile, uma izinga lokushisa liphakeme, kuba kubi kakhulu ukugcinwa kwamanzi. Uma izinga lokushisa le-mortar lidlula ama-40°C, ukugcinwa kwamanzi kwe-methyl cellulose kuzoncishiswa kakhulu, okuzothinta kakhulu ukwakhiwa kwe-mortar.
(4) I-Methyl cellulose inomthelela omkhulu ekwakhiweni nasekunamatheleni kwe-mortar. “Ukunamathela” lapha kubhekisela emandleni okunamathela azwakala phakathi kwethuluzi lokufaka isicelo somsebenzi kanye ne-substrate yodonga, okungukuthi, ukumelana nokusika kwe-mortar. Ukunamathela kuphakeme, ukumelana nokusika kwe-mortar kukhulu, futhi amandla adingekayo yizisebenzi enkambisweni yokusebenzisa nawo makhulu, futhi ukusebenza kokwakha kwe-mortar kuphansi. Ukunamathela kwe-Methyl cellulose kusezingeni eliphakathi emikhiqizweni ye-cellulose ether.
I-HPMC yi-hydroxypropyl methylcellulose, okuyi-ether exubile ye-cellulose engeyona i-ionic eyenziwe ngokotini ocolisisiwe ngemva kokuhlanganiswa kwe-alkali, kusetshenziswa i-propylene oxide kanye ne-methyl chloride njengezinto ezibangela i-etherification, kanye nochungechunge lwezimpendulo. Izinga lokushintshana ngokuvamile lingu-1.2 ~ 2.0. Izakhiwo zayo zihlukile ngenxa yezilinganiso ezahlukene zokuqukethwe kwe-methoxyl kanye nokuqukethwe kwe-hydroxypropyl.
(1) I-Hydroxypropyl methylcellulose incibilika kalula emanzini abandayo, futhi izobhekana nobunzima ekuncibilikeni emanzini ashisayo. Kodwa izinga lokushisa layo le-gelation emanzini ashisayo liphakeme kakhulu kunele-methyl cellulose. Ukuncibilika emanzini abandayo nakho kuthuthuke kakhulu uma kuqhathaniswa ne-methyl cellulose.
(2) Ukuqina kwe-hydroxypropyl methylcellulose kuhlobene nesisindo sayo sama-molecule, futhi uma isisindo sama-molecule sikhulu, kulapho ukuqina kwe-viscosity kuphakama khona. Izinga lokushisa lithinta nokuqina kwayo, njengoba izinga lokushisa likhuphuka, ukuqina kwe-viscosity kwehla. Kodwa-ke, ukuqina kwayo okuphezulu kunomphumela wokushisa ophansi kune-methyl cellulose. Isixazululo sayo sizinzile uma sigcinwe ekushiseni kwegumbi.
(3) I-Hydroxypropyl methylcellulose izinzile ku-asidi kanye ne-alkali, futhi isixazululo sayo samanzi sizinzile kakhulu ku-pH=2~12. I-Caustic soda kanye namanzi e-lime awanawo umthelela omkhulu ekusebenzeni kwayo, kodwa i-alkali ingasheshisa ukuncibilika kwayo futhi ikhulise i-viscosity yayo. I-Hydroxypropyl methylcellulose izinzile ku-viscosity evamile, kodwa lapho ukuhlushwa kwesisombululo sikasawoti kuphezulu, i-viscosity yesisombululo se-hydroxypropyl methylcellulose ivame ukwanda.
(4) Ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose kuncike enanini layo lokwengeza, i-viscosity, njll., futhi izinga layo lokugcinwa kwamanzi ngaphansi kwenani elifanayo lokwengeza liphakeme kunele-methyl cellulose.
(5) I-hydroxypropyl methylcellulose ingaxutshwa nama-polymer compounds ancibilika emanzini ukuze kwakheke isixazululo esifanayo nesinobuthi obuphezulu. Njenge-polyvinyl alcohol, i-starch ether, i-vegetable gum, njll.
(6) Ukunamathela kwe-hydroxypropyl methylcellulose ekwakhiweni kwe-mortar kuphakeme kunokwe-methylcellulose.
(7) I-hydroxypropyl methylcellulose inokumelana okungcono kwama-enzyme kune-methylcellulose, futhi isixazululo sayo cishe asikwazi ukuwohloka ngama-enzyme kune-methylcellulose.
Isikhathi sokuthunyelwe: Ephreli-17-2023