1. I-Hydroxypropyl methyl cellulose
I-Hydroxypropyl methylcelluloseuhlobo lwe-cellulose olukhiqizayo futhi olusetshenziswayo lukhula ngokushesha. Luyi-ether exubile ye-cellulose engeyona i-ionic eyenziwe ngokotini ocwengekile ngemva kokuhlanganiswa kwe-alkali, kusetshenziswa i-propylene oxide kanye ne-methyl chloride njenge-etherification, ngokusebenzisa uchungechunge lwezimpendulo. Izinga lokushintshana ngokuvamile lingu-1.2 ~ 2.0. Izakhiwo zalo ziyahlukahluka kuye ngesilinganiso sokuqukethwe kwe-methoxyl kokuqukethwe 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) (2) Ukuqina kwe-hydroxypropyl methylcellulose kuhlobene nesisindo sayo sama-molecule, futhi uma isisindo sama-molecule sikhulu, kulapho ukuqina kwe-viscosity kuphakama khona. Izinga lokushisa liphinde lithinte ukuqina kwayo, njengoba izinga lokushisa landa, ukuqina kwe-viscosity kwehla. Kodwa-ke, ithonya lokuqina kwayo okuphezulu kanye nokushisa liphansi kunele-methyl cellulose. Isixazululo sayo sizinzile uma sigcinwa ekushiseni kwegumbi.
(3) 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.
(4) 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 izinga layo lokuncibilika futhi ikhuphule kancane i-viscosity yayo. I-Hydroxypropyl methylcellulose izinzile ku-viscosity evamile, kodwa lapho ukuhlushwa kwesisombululo sikasawoti kuphezulu, i-viscosity yesisombululo se-hydroxypropyl methylcellulose ivame ukwanda.
(5) I-hydroxypropyl methylcellulose ingaxutshwa nama-polymer ancibilika emanzini ukuze kwakheke isixazululo esifana kakhulu nesinobuthi obuphezulu. Njenge-polyvinyl alcohol, i-starch ether, i-vegetable gum, njll.
(6) I-hydroxypropyl methylcellulose inokumelana okungcono kwama-enzyme kune-methylcellulose, futhi isixazululo sayo cishe asikwazi ukuwohloka ngama-enzyme kune-methylcellulose.
(7) Ukunamathela kwe-hydroxypropyl methylcellulose ekwakhiweni kwe-mortar kuphakeme kunokwe-methylcellulose.
2. I-Hydroxyethyl cellulose
Yenziwe ngokotini ocoliwe ophathwe nge-alkali, futhi ixutshwe ne-ethylene oxide njenge-etherification agent lapho kukhona i-isopropanol. Izinga layo lokushintsha ngokuvamile lingu-1.5 ~ 2.0. Inamandla okushintsha amanzi futhi kulula ukuyimunca umswakama.
(1) I-Hydroxyethyl cellulose iyancibilika emanzini abandayo, kodwa kunzima ukuyincibilika emanzini ashisayo. Isixazululo sayo sizinzile ekushiseni okuphezulu ngaphandle kokufaka i-gelling. Ingasetshenziswa isikhathi eside ngaphansi kokushisa okuphezulu ku-mortar, kodwa ukugcinwa kwamanzi kwayo kuphansi kune-methyl cellulose.
(2)I-Hydroxyethyl celluloseizinzile ku-asidi ejwayelekile kanye ne-alkali, futhi i-alkali ingasheshisa ukuncibilika kwayo futhi ikhuphule kancane i-viscosity yayo. Ukuhlakazeka kwayo emanzini kubi kancane kunokwe-methyl cellulose kanye ne-hydroxypropyl methyl cellulose.
(3) I-Hydroxyethyl cellulose inamandla amahle okulwa nokuwohloka kwe-mortar, kodwa inesikhathi eside sokulibazisa i-samente.
(4) Ukusebenza kwe-hydroxyethyl cellulose ekhiqizwa amanye amabhizinisi asekhaya kusobala ukuthi kuphansi kunokwe-methyl cellulose ngenxa yokuqukethwe kwayo kwamanzi amaningi kanye nokuqukethwe komlotha okuphezulu.
(5) Ukubola kwesisombululo samanzi se-hydroxyethyl cellulose kuyingozi kakhulu. Ezingeni lokushisa elingaba ngu-40°C, ukubola kungavela zingakapheli izinsuku ezi-3 kuya kwezi-5, okuzothinta ukusebenza kwayo.
Isikhathi sokuthunyelwe: Ephreli-28-2024