I-MC iyi-methyl cellulose, etholakala ngokwelapha ukotini ocwengekile nge-alkali, kusetshenziswa i-methyl chloride njenge-ether ethobisayo, nokwenza i-cellulose ether ngochungechunge lwezimpendulo. Ngokuvamile, izinga lokushintsha liyi-1.6 ~ 2.0, kanti ukuncibilika nakho kuhlukile ngamazinga ahlukene okushintsha. Ingeyase-non-ionic cellulose ether.
(1) Ukugcinwa kwamanzii-methyl cellulosekuncike 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 linethonya elikhulu kakhulu esilinganisweni sokugcinwa kwamanzi, futhi izinga le-viscosity alilingani 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, kodwa kunzima ukuyincibilika emanzini ashisayo, futhi 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 isimo se-gelation.
(3) Ukushintsha kwezinga lokushisa kuzothinta 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 kuzoba kubi kakhulu, okuzothinta kakhulu ukusebenza kahle kwe-mortar.
(4) I-Methyl cellulose inomthelela omkhulu ekusebenzeni nasekunamatheleni kwe-mortar. Igama elithi “Adhesion” lapha libhekisela ekunamatheleni okuzwakalayo phakathi kwethuluzi lokufaka isicelo somsebenzi kanye ne-substrate yodonga, okungukuthi, ukumelana nokusika kwe-mortar. Ukunamathela kukhulu, ukumelana nokusika kwe-mortar kukhulu, futhi amandla adingekayo yizisebenzi enkambisweni yokusebenzisa nawo makhulu, futhi ukwakhiwa kwe-mortar kuphansi. Ukunamathela kwe-Methylcellulose kusezingeni eliphakathi emikhiqizweni ye-cellulose ether.
I-HPMC iyi-hydroxypropyl methyl cellulose, okuyi-ether exubile ye-cellulose engeyona i-ionic eyenziwe ngokotini ocwengekile ngemuva kokwelashwa nge-alkali, kusetshenziswa i-propylene oxide kanye ne-methyl chloride njengezinto eziqinisayo, kanye nochungechunge lwezimpendulo. Izinga lokushintshana ngokuvamile liyi-1.2 kuya ku-2.0. Izakhiwo zayo ziyahlukahluka kuye ngesilinganiso sokuqukethwe kwe-methoxyl kanye nokuqukethwe kwe-hydroxypropyl.
(1) I-Hydroxypropyl methylcellulose incibilika kalula emanzini abandayo, kodwa 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 nobukhulu besisindo sayo sama-molecule, futhi uma isisindo sama-molecule sikhulu, kulapho ukuqina kwe-viscosity kuphakama khona. Izinga lokushisa lithinta nokuqina kwayo, njengoba izinga lokushisa landa, ukuqina kwe-viscosity kwehla. Kodwa ukuqina kwayo akuthinteki kakhulu ngokushisa okuphezulu kune-methyl cellulose. Isixazululo sayo sizinzile lapho sigcinwa 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 yandise i-viscosity. I-Hydroxypropyl methylcellulose izinzile kusawoti ovamile, kodwa lapho ukuhlushwa kwesisombululo sikasawoti kuphezulu, i-viscosity yesisombululo se-hydroxypropyl methylcellulose ivame ukwanda.
(4) Ukugcinwa kwamanzii-hydroxypropyl methylcellulosekuncike enanini layo lokwengeza, i-viscosity, njll. Izinga lokugcina amanzi ngaphansi kwenani elifanayo lokwengeza liphakeme kunele-methyl cellulose.
(5) I-hydroxypropyl methylcellulose ingaxutshwa nama-polymer compounds ancibilika emanzini ukuze kwakheke isixazululo esinobuthi obufanayo nobuphezulu. 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 nama-enzyme kune-methylcellulose, futhi ithuba layo lokubola kwe-enzymatic solution liphansi kunele-methylcellulose.
Isikhathi sokuthunyelwe: Ephreli-28-2024