Ukuqina kwe-Sodium Carboxymethyl Cellulose

I-viscosity ye-sodium carboxymethyl cellulose nayo ihlukaniswe ngama-grade amaningi ngokwezindlela ezahlukene zokusebenzisa. I-viscosity yohlobo lokuwasha ingu-10~70 (ngaphansi kuka-100), umkhawulo ophezulu we-viscosity usukela ku-200~1200 wokuhlobisa izakhiwo kanye neminye imboni, kanti i-viscosity ye-food grade iphakeme nakakhulu. Zonke zingaphezu kuka-1000, futhi i-viscosity yezimboni ezahlukene ayifani.

Ngenxa yokusetshenziswa kwayo okubanzi.
I-viscosity ye-sodium carboxymethyl cellulose ithintwa yisisindo sayo sama-molecule, ukuhlushwa, izinga lokushisa kanye nenani le-pH, futhi ixutshwa ne-ethyl noma i-carboxypropyl cellulose, i-gelatin, i-xanthan gum, i-carrageenan, i-locust bean gum, i-guar gum, i-agar, i-sodium alginate, i-pectin, i-gum arabic kanye nesitashi futhi izithako zayo zihambisana kahle (okungukuthi umphumela wokubambisana).

Uma inani le-pH lingu-7, i-viscosity yesisombululo se-sodium carboxymethyl cellulose iba phezulu kakhulu, futhi uma inani le-pH lingu-4 ~ 11, lizinzile. I-Carboxymethylcellulose ngesimo se-alkali metal kanye nosawoti we-ammonium iyancibilika emanzini. Ama-ion ensimbi ahlukene i-Ca2+, i-Mg2+, i-Fe2+ angathinta i-viscosity yayo. Izinsimbi ezisindayo njengesiliva, i-barium, i-chromium noma i-Fe3+ zingenza ukuthi iphume esixazululweni. Uma ukuhlushwa kwama-ion kulawulwa, njengokwengezwa kwe-citric acid, isixazululo esiqinile singakhiwa, okuholela ku-gum ethambile noma eqinile.

I-Sodium carboxymethyl cellulose uhlobo lwe-cellulose yemvelo, evame ukwenziwa nge-cotton linter noma i-wood pulp njengezinto zokusetshenziswa futhi ibhekana nokusabela kwe-etherification ne-monochloroacetic acid ngaphansi kwezimo ze-alkaline.

Ngokwezincazelo zezinto zokusetshenziswa kanye nokufakwa esikhundleni kwe-hydroxyl hydrogen kuyunithi ye-cellulose D-glucose yiqembu le-carboxymethyl, kutholakala ama-polymer ancibilikayo emanzini anamazinga ahlukene okufakwa esikhundleni kanye nokusabalalisa kwesisindo sama-molecule ahlukene.

Ngenxa yokuthi i-sodium carboxymethyl cellulose inezici eziningi eziyingqayizivele nezinhle kakhulu, isetshenziswa kabanzi embonini yamakhemikhali yansuku zonke, ekudleni nakwezokwelapha kanye nakwezinye izinhlobo zezimboni.

Esinye sezibonakaliso ezibaluleke kakhulu ze-sodium carboxymethyl cellulose ukuthambeka kwe-sodium carboxymethyl cellulose. Inani le-viscosity lihlobene nezici ezahlukahlukene njengokuthambeka, izinga lokushisa kanye nesivinini sokucheba. Kodwa-ke, izici ezifana nokuthambeka, izinga lokushisa kanye nesivinini sokucheba yizici zangaphandle ezithinta ukuthambeka kwe-sodium carboxymethyl cellulose.

Isisindo sayo sama-molecule kanye nokusatshalaliswa kwama-molecule yizici zangaphakathi ezithinta i-viscosity yesisombululo se-sodium carboxymethyl cellulose. Ukuze kulawulwe ukukhiqizwa kanye nokuthuthukiswa kokusebenza komkhiqizo we-sodium carboxymethyl cellulose, ukucwaninga ngesisindo sayo sama-molecule kanye nokusatshalaliswa kwesisindo sama-molecule kunenani elibaluleke kakhulu lokubhekisela, kuyilapho i-viscosity Ukulinganisa kungadlala indima ethile yokubhekisela kuphela.

Imithetho kaNewton ku-rheology, sicela ufunde okuqukethwe okufanele kwe-"rheology" ku-physical chemistry, kunzima ukuchaza ngomusho owodwa noma emibili. Uma kufanele ukusho: ngesisombululo esincibilikisiwe se-cmc eduze noketshezi lwe-Newtonian, ukucindezeleka kwe-shear kuhambelana nesilinganiso somphetho osikiwe, kanti i-coefficient elinganayo phakathi kwazo ibizwa ngokuthi i-viscosity coefficient noma i-kinematic viscosity.

Ukuqina kutholakala emandleni aphakathi kwamaketanga e-cellulose molecular, okuhlanganisa amandla okusabalala kanye nama-hydrogen bonds. Ikakhulukazi, i-polymerization yama-cellulose derivatives akuyona isakhiwo esiqondile kodwa isakhiwo esinamagatsha amaningi. Esixazululweni, ama-cellulose amaningi anamagatsha amaningi axhumene ukuze akhe isakhiwo senethiwekhi yendawo. Uma isakhiwo siqinile, kulapho amandla aphakathi kwamaketanga e-molecule esisombululoni esiphumelayo aba maningi khona.

Ukuze kukhiqizwe ukugeleza esixazululweni esincibilikisiwe sezinto eziphuma ku-cellulose, amandla aphakathi kwamaketanga ama-molecule kumele anqotshwe, ngakho-ke isixazululo esinezinga eliphezulu le-polymerization sidinga amandla amakhulu ukuze kukhiqizwe ukugeleza. Ukuze kulinganiswe i-viscosity, amandla esixazululweni se-CMC adonsela phansi. Ngaphansi kwesimo se-gravity engaguquki, isakhiwo seketanga sesisombululo se-CMC esinezinga elikhulu le-polymerization sinamandla amakhulu, futhi ukugeleza kuhamba kancane. Ukugeleza okuhamba kancane kubonisa i-viscosity.

Ukuqina kwe-sodium carboxymethyl cellulose kuhlobene kakhulu nesisindo sama-molecule, futhi akunandaba kangako nezinga lokushintsha. Uma izinga lokushintsha lilikhulu, kulapho isisindo sama-molecule sikhulu khona, ngoba isisindo sama-molecule seqembu le-carboxymethyl elishintshiwe sikhulu kuneqembu le-hydroxyl langaphambilini.

Usawoti we-sodium we-cellulose carboxymethyl ether, i-anionic cellulose ether, iyimpuphu noma i-granule emhlophe noma enobisi, enobuningi obungu-0.5-0.7 g/cm3, cishe ayinaphunga, ayinambitheki, futhi i-hygroscopic. Kulula ukuhlakazeka emanzini ukuze kwakheke isixazululo se-colloidal esibonakalayo, futhi ayincibiliki ezinyibilikisini eziphilayo ezifana ne-ethanol. I-pH yesisombululo samanzi esingu-1% ingu-6.5 kuya ku-8.5. Uma i-pH ingaphezulu kuka-10 noma ngaphansi kuka-5, i-viscosity ye-sodium carboxymethylcellulose incishiswa kakhulu, futhi ukusebenza kwayo kungcono kakhulu uma i-pH = 7.

Izinzile ngokwezinga lokushisa. I-viscosity ikhuphuka ngokushesha ngaphansi kwama-20℃, futhi ishintsha kancane kuma-45℃. Ukushisa isikhathi eside ngaphezu kwama-80℃ kungalimaza i-colloid futhi kunciphise i-viscosity kanye nokusebenza kwayo kakhulu. Incibilika kalula emanzini, futhi ikhambi liyabonakala; lizinzile kakhulu kwikhambi le-alkaline, futhi kulula ukulifaka emanzini uma kukhona i-asidi. Uma inani le-pH lingu-2-3, lizokwehla.