I-MC i-methyl cellulose, etholakala ngokwelapha ukotini ocolisisiwe nge-alkali, kusetshenziswa i-methyl chloride njenge-ejenti ye-etherifying, nokwenza i-cellulose ether ngochungechunge lokusabela. Ngokuvamile, izinga lokushintsha lingu-1.6~2.0, futhi ukunyibilika nakho kuhlukile ngamazinga ahlukene okushintsha. Okwe-non-ionic cellulose ether.
(1) Ukugcinwa kwamanzi kwei-methyl cellulosekuncike enanini layo lokwengeza, i-viscosity, ubuhle bezinhlayiyana kanye nezinga lokuqedwa. Ngokuvamile, uma inani lokwengeza likhulu, ubuhle buncane, futhi i-viscosity inkulu, izinga lokugcinwa kwamanzi liphezulu. Phakathi kwazo, inani lokwengeza linethonya elikhulu ekugcinweni kwamanzi, futhi izinga le-viscosity alilingani nezinga lokugcinwa kwamanzi. Izinga lokuhlakazeka lincike ikakhulukazi ezingeni lokuguqulwa kwendawo yezinhlayiya ze-cellulose kanye nokucoleka kwezinhlayiya. Phakathi kwama-cellulose ether angenhla, i-methyl cellulose ne-hydroxypropyl methyl cellulose anamazinga aphezulu okugcina amanzi.
(2) I-Methylcellulose iyancibilika emanzini abandayo, kodwa kunzima ukuyincibilika emanzini ashisayo, futhi isisombululo sayo esinamanzi sizinzile kakhulu ebangeni le-pH = 3 ~ 12. Inokuhambisana okuhle nesitashi, i-guar gum, njll. kanye nama-surfactants amaningi. Lapho izinga lokushisa lifinyelela izinga lokushisa le-gelation, kwenzeka i-gelation.
(3) Ukushintsha kwezinga lokushisa kuzothinta kakhulu izinga lokugcinwa kwamanzi e-methyl cellulose. Ngokuvamile, lapho izinga lokushisa liphezulu, kuba kubi nakakhulu ukugcinwa kwamanzi. Uma izinga lokushisa lodaka lingaphezu kuka-40 °C, ukugcinwa kwamanzi kwe-methyl cellulose kuzoba kubi kakhulu, okuzophazamisa kakhulu ukusebenza kodaka.
(4) I-Methyl cellulose inomthelela omkhulu ekusebenzeni nasekubambeleleni kodaka. “Ukunamathela” lapha kubhekisela ekunamatheleni okuzwakalayo phakathi kwethuluzi lokufaka isicelo lesisebenzi nengxenye engaphansi yodonga, okungukuthi, ukumelana nokugunda kodaka. I-adhesion inkulu, ukumelana kwe-shear kodaka kukhulu, futhi amandla adingwa ngabasebenzi ekusetshenzisweni kwenqubo nawo makhulu, futhi ukwakhiwa kodaka kumpofu. I-Methylcellulose adhesion isezingeni elilinganiselwe emikhiqizweni ye-cellulose ether.
I-HPMC iyi-hydroxypropyl methyl cellulose, okuyi-ether engeyona i-ionic cellulose eyenziwe ngokotini ocolisisiwe ngemuva kokwelashwa kwe-alkali, kusetshenziswa i-propylene oxide ne-methyl chloride njengama-etherifying agents, futhi ngochungechunge lokusabela. Izinga lokushintsha ngokuvamile lingu-1.2 kuya ku-2.0. Izakhiwo zayo ziyahlukahluka kuye ngenani lokuqukethwe kwe-methoxyl nokuqukethwe kwe-hydroxypropyl.
(1) IHydroxypropyl methylcellulose incibilika kalula emanzini abandayo, kodwa izohlangabezana nobunzima ekuncibilikeni emanzini ashisayo. Kodwa izinga lokushisa layo le-gelation emanzini ashisayo liphakeme kakhulu kunalelo le-methyl cellulose. Ukuncibilika emanzini abandayo nakho kuba ngcono kakhulu uma kuqhathaniswa ne-methyl cellulose.
(2) I-viscosity ye-hydroxypropyl methylcellulose ihlobene nosayizi wesisindo sayo samangqamuzana, futhi uma sikhulu isisindo samangqamuzana, i-viscosity iphakama. Ukushisa nakho kuthinta i-viscosity yayo, njengoba izinga lokushisa likhuphuka, i-viscosity iyancipha. Kodwa i-viscosity yayo ayithinteki kangako ekushiseni okuphezulu kune-methyl cellulose. Isixazululo saso sizinzile kwisitoreji ekamelweni lokushisa.
(3) I-Hydroxypropyl methylcellulose izinzile ku-asidi ne-alkali, futhi isisombululo sayo esinamanzi sizinzile kakhulu ebangeni le-pH=2~12. I-Caustic soda namanzi e-lime anethonya elincane ekusebenzeni kwawo, kodwa i-alkali ingasheshisa ukuqedwa kwayo futhi ikhulise i-viscosity. I-Hydroxypropyl methylcellulose izinzile kusawoti ovamile, kodwa lapho ukugxila kwesisombululo sikasawoti kuphezulu, i-viscosity yesisombululo se-hydroxypropyl methylcellulose ivame ukwanda.
(4) Ukugcinwa kwamanzi kwei-hydroxypropyl methylcellulosekuncike enanini layo elingeziwe, i-viscosity, njll. Izinga lokugcinwa kwamanzi ngaphansi kwesamba esifanayo sokwengezwa liphezulu kunalelo le-methyl cellulose.
(5) I-Hydroxypropyl methylcellulose ingaxutshwa nezinhlanganisela ze-polymer ezincibilika emanzini ukuze zakhe isixazululo esinomfaniswano kanye ne-viscosity ephakeme. Okufana ne-polyvinyl alcohol, isitashi ether, ushingamu wemifino, njll.
(6) Ukunamathela kwe-hydroxypropyl methylcellulose ekwakhiweni kodaka kungaphezulu kwalokho kwe-methylcellulose.
(7) I-Hydroxypropyl methylcellulose inokumelana kangcono nama-enzyme kune-methylcellulose, futhi kungenzeka ukuthi isisombululo sayo sokuwohloka kwe-enzymatic siphansi kunaleyo ye-methylcellulose.
Isikhathi sokuthumela: Apr-28-2024