1.I-Hydroxypropyl methyl cellulose
I-Hydroxypropyl methylcelluloseiwuhlobo lwe-cellulose okukhipha kanye nokusetshenziswa kwalo kukhula ngokushesha. I-ether engeyona i-ionic cellulose exutshwe ukotini ocolisisiwe ngemva kokwenziwa kwe-alkalization, kusetshenziswa i-propylene oxide ne-methyl chloride njenge-etherification agent, ngochungechunge lokusabela. Izinga lokushintsha ngokuvamile liyi-1.2 ~ 2.0. Izakhiwo zayo ziyahlukahluka kuye ngesilinganiso sokuqukethwe kwe-methoxyl kokuqukethwe kwe-hydroxypropyl.
(1) IHydroxypropyl methylcellulose incibilika kalula emanzini abandayo, futhi izohlangabezana nobunzima ekuncibilikeni emanzini ashisayo. Kodwa izinga lokushisa layo le-gelation emanzini ashisayo liphakeme kakhulu kunalelo le-methyl cellulose. I-solubility emanzini abandayo nayo ithuthuke kakhulu uma iqhathaniswa ne-methyl cellulose.
(2) (2) I-viscosity ye-hydroxypropyl methylcellulose ihlobene nesisindo sayo samangqamuzana, futhi uma sikhulu isisindo samangqamuzana, i-viscosity iphakama. Ukushisa nakho kuthinta i-viscosity yayo, njengoba izinga lokushisa likhuphuka, i-viscosity iyancipha. Kodwa-ke, ithonya le-viscosity yayo ephezulu kanye nezinga lokushisa liphansi kunalelo le-methyl cellulose. Isixazululo saso sizinzile uma sigcinwe ekamelweni lokushisa.
(3) Ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose kuncike enanini layo elingeziwe, i-viscosity, njll., futhi izinga layo lokugcinwa kwamanzi ngaphansi kwenani elifanayo lokwengezwa lingaphezulu kwele-methyl cellulose.
(4) 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 izinga lokuchithwa kwayo futhi ikhulise kancane i-viscosity yayo. IHydroxypropyl methylcellulose izinzile kusawoti ovamile, kodwa lapho ukuhlangana kwesixazululo sikasawoti kuphezulu, i-viscosity ye-hydroxypropyl methylcellulose solution ivame ukwanda.
(5) I-Hydroxypropyl methylcellulose ingaxutshwa nama-polymers ancibilika emanzini ukuze kwakheke isixazululo se-homogeneous, esiphezulu-viscosity. Okufana ne-polyvinyl alcohol, isitashi ether, ushingamu wemifino, njll.
(6) I-Hydroxypropyl methylcellulose inokumelana ne-enzyme okungcono kune-methylcellulose, futhi isisombululo sayo mancane amathuba okuthi sonakaliswe ama-enzyme kune-methylcellulose.
(7) Ukunamathela kwe-hydroxypropyl methylcellulose ekwakhiweni kodaka kungaphezulu kwalokho kwe-methylcellulose.
2. I-Hydroxyethyl cellulose
Yenziwe kusukela kukotini ocolile ophathwe nge-alkali, futhi isabela nge-ethylene oxide njenge-etherification agent phambi kwe-isopropanol. Izinga layo lokushintsha ngokuvamile liyi-1.5 ~ 2.0. Ine-hydrophilicity eqinile futhi kulula ukumunca umswakama.
(1) I-Hydroxyethyl cellulose iyancibilika emanzini abandayo, kodwa kunzima ukuyincibilika emanzini ashisayo. Isixazululo saso sizinzile ekushiseni okuphezulu ngaphandle kwe-gelling. Ingasetshenziswa isikhathi eside ngaphansi kokushisa okuphezulu odakeni, kodwa ukugcinwa kwayo kwamanzi kuphansi kunaleyo ye-methyl cellulose.
(2)I-Hydroxyethyl celluloseizinzile ku-asidi evamile kanye ne-alkali, futhi i-alkali ingasheshisa ukuqedwa kwayo futhi ikhulise kancane i-viscosity yayo. Ukuhlakazeka kwayo emanzini kubi kakhulu kunaleyo ye-methyl cellulose ne-hydroxypropyl methyl cellulose.
(3) I-Hydroxyethyl cellulose inokusebenza okuhle kwe-anti-sag kudaka, kodwa inesikhathi eside sokuhlehlisa usimende.
(4) Ukusebenza kwe-hydroxyethyl cellulose ekhiqizwa amanye amabhizinisi asekhaya ngokusobala kuphansi kunaleyo ye-methyl cellulose ngenxa yokuqukethwe kwayo okuphezulu kwamanzi kanye nomlotha omningi.
(5) Isikhutha sesisombululo esinamanzi se-hydroxyethyl cellulose sibucayi kakhulu. Emazingeni okushisa angaba ngu-40 ° C, isikhutha singenzeka phakathi kwezinsuku ezi-3 kuya kwezingu-5, okuzothinta ukusebenza kwayo.
Isikhathi sokuthumela: Apr-28-2024