I-Sodium Carboxymethyl Cellulose Viscosity

I-viscosity ye-sodium carboxymethyl cellulose nayo ihlukaniswe ngamamaki amaningi ngokuya ngokusetshenziswa okuhlukile. I-viscosity yohlobo lokugeza yi-10 ~ 70 (ngaphansi kwe-100), umkhawulo ophezulu we-viscosity usuka ku-200 ~ 1200 wokuhlobisa izakhiwo nezinye izimboni, futhi i-viscosity yebanga lokudla iphakeme nakakhulu. Zonke zingaphezu kuka-1000, futhi i-viscosity yezimboni ezihlukahlukene ayifani.

Ngenxa yobubanzi bayo bokusetshenziswa.
I-viscosity ye-sodium carboxymethyl cellulose ithintwa isisindo sayo samangqamuzana, ukugxila, izinga lokushisa kanye nenani le-pH, futhi ixutshwa ne-ethyl noma i-carboxypropyl cellulose, i-gelatin, i-xanthan gum, i-carrageenan, ushingamu wezinkumbi, i-guar gum, i-agar, i-sodium alginate, i-pectin, i-gum arabic kanye nesitashi kanye nokuphuma kwayo kunokuhambisana okuhle (okungukuthi i-synergistic umphumela).

Uma inani le-pH lingu-7, i-viscosity yesisombululo se-sodium carboxymethyl cellulose iphakeme kakhulu, futhi uma inani le-pH lingu-4~11, lizinzile. I-Carboxymethylcellulose esesimweni sensimbi ye-alkali nosawoti we-ammonium iyancibilika emanzini. I-Divalent metal ions Ca2+, Mg2+, Fe2+ ingathinta i-viscosity yayo. Izinsimbi ezisindayo njengesiliva, i-barium, i-chromium noma i-Fe3+ zingayenza iphume isixazululo. Uma ukuhlushwa kwama-ion kulawulwa, njengokwengezwa kwe-agent ye-chelating citric acid, isisombululo se-viscous esithe xaxa singase senziwe, okuholela ekutheni kube negum ethambile noma eqinile.

I-sodium carboxymethyl cellulose iwuhlobo lwe-cellulose yemvelo, ngokuvamile eyenziwa nge-cotton linter noma i-pulp yokhuni njengezinto zokusetshenziswa futhi ingaphansi kokusabela kwe-etherification nge-monochloroacetic acid ngaphansi kwezimo ze-alkali.

Ngokucaciswa kwezinto ezingavuthiwe kanye nokufakwa esikhundleni kwe-hydroxyl hydrogen kuyunithi ye-cellulose D-glucose yiqembu le-carboxymethyl, kutholakala amakhompiyutha e-polymer ancibilika emanzini anamazinga ahlukene okushintsha kanye nokusabalalisa kwesisindo samangqamuzana ahlukene.

Ngenxa yokuthi i-sodium carboxymethyl cellulose inezici eziningi eziyingqayizivele nezinhle kakhulu, isetshenziswa kabanzi embonini yamakhemikhali yansuku zonke, ukudla nemithi nokunye ukukhiqizwa kwezimboni.

Enye yezinkomba ezibaluleke kakhulu ze-sodium carboxymethyl cellulose yi-viscosity ye-sodium carboxymethyl cellulose. Inani le-viscosity lihlobene nezici ezihlukahlukene ezifana nokugxila, izinga lokushisa kanye nesilinganiso se-shear. Kodwa-ke, izici ezifana nokugxila, izinga lokushisa kanye nesilinganiso se-shear yizici zangaphandle ezithinta i-viscosity ye-sodium carboxymethyl cellulose.

Isisindo sayo samangqamuzana nokusatshalaliswa kwamangqamuzana yizici zangaphakathi ezithinta i-viscosity yesisombululo se-sodium carboxymethyl cellulose. Ngokulawulwa kokukhiqiza kanye nokuthuthukiswa kokusebenza komkhiqizo we-sodium carboxymethyl cellulose, ukucwaninga isisindo sayo samangqamuzana nokusatshalaliswa kwesisindo samangqamuzana kunereferensi ebaluleke kakhulu, kuyilapho i-viscosity Isilinganiso singadlala indima ethile kuphela yereferensi.

Imithetho ka-Newton ku-rheology, sicela ufunde okuqukethwe okufanelekile kwe-"rheology" kumakhemikhali angokwenyama, kunzima ukuchaza ngomusho owodwa noma emibili. Uma kufanele ukusho: ukuze uthole isisombululo esicwebezelayo se-cmc esiseduze ne-Newtonian fluid, ukucindezeleka kwe-shear kuhambisana nezinga lokusika, futhi i-coefficient elinganayo phakathi kwabo ibizwa ngokuthi i-viscosity coefficient noma i-kinematic viscosity.

I-viscosity itholakala emandleni phakathi kwamaketanga e-cellulose yamangqamuzana, okuhlanganisa amandla okuhlakazeka kanye nezibopho ze-hydrogen. Ikakhulukazi, i-polymerization ye-cellulose derivatives ayiyona isakhiwo esiqondile kodwa isakhiwo esinamagatsha amaningi. Esixazululweni, i-cellulose eminingi enamagatsha amaningi ahlanganiswe ukuze enze isakhiwo senethiwekhi yendawo. Ukuqina kwesakhiwo, amandla amakhulu phakathi kwamaketanga amangqamuzana esixazululweni esiwumphumela.

Ukuze ukhiqize ukugeleza kwesisombululo esincibilikisiwe sokuphuma kwe-cellulose, amandla phakathi kwamaketanga amangqamuzana kufanele anqotshwe, ngakho-ke isisombululo esinezinga eliphezulu le-polymerization sidinga amandla amakhulu ukukhiqiza ukugeleza. Ngokulinganisa i-viscosity, amandla kusixazululo se-CMC amandla adonsela phansi. Ngaphansi kwesimo sokudonsela phansi okuqhubekayo, isakhiwo seketanga lesisombululo se-CMC ngezinga elikhulu le-polymerization sinamandla amakhulu, futhi ukugeleza kuhamba kancane. Ukugeleza okunensayo kukhombisa i-viscosity.

I-viscosity ye-sodium carboxymethyl cellulose ihlobene kakhulu nesisindo samangqamuzana, futhi ayihlangene kancane nezinga lokushintsha. Uma izinga lokushintsha likhulu, isisindo samangqamuzana sikhulu, ngoba isisindo samangqamuzana eqembu le-carboxymethyl esithathelwe indawo sikhulu kuneqembu langaphambili le-hydroxyl.

Usawoti we-sodium we-cellulose carboxymethyl ether, i-anionic cellulose ether, iyimpushana emhlophe noma emhlophe emhlophe noma i-granule, enobuningi obungu-0.5-0.7 g/cm3, cishe ayinaphunga, ayinambitheki, futhi i-hygroscopic. Kulula ukuhlakazeka emanzini ukwenza isixazululo se-colloidal esobala, futhi ayincibiliki kumakhemikhali ezinto eziphilayo njenge-ethanol. I-pH ye-1% yesisombululo esinamanzi ngu-6.5 kuya ku-8.5. Uma i-pH>10 noma i-<5, i-viscosity ye-sodium carboxymethylcellulose incipha kakhulu, futhi ukusebenza kuba kuhle kakhulu uma i-pH=7.

Azinzile ngokushisa. I-viscosity ikhuphuka ngokushesha ngaphansi kuka-20 ℃, futhi ishintsha kancane ku-45 ℃. Ukushisa isikhathi eside ngaphezu kuka-80 ℃ kungashintsha i-colloid futhi kunciphise i-viscosity nokusebenza kakhulu. Incibilika kalula emanzini, futhi isisombululo sisobala; uzinzile kakhulu kwisisombululo se-alkaline, futhi kulula ukwenza i-hydrolyze phambi kwe-asidi. Uma inani le-pH lingu-2-3, lizoshona.