I-viscosity ye-sodium carboxymethyl cellulose ikwahlulwe ngokwamanqanaba amaninzi ngokweendlela ezahlukeneyo zokusetyenziswa. I-viscosity yohlobo lokuhlamba i-10 ~ 70 (ngaphantsi kwe-100), umda ophezulu we-viscosity uvela kwi-200 ~ 1200 yokuhlobisa izakhiwo kunye namanye amashishini, kwaye i-viscosity yebakala lokutya iphezulu ngakumbi. Zonke zingaphezulu kwe-1000, kwaye i-viscosity yamashishini ahlukeneyo ayifani.
Ngenxa yoluhlu olubanzi lokusetyenziswa.
I-viscosity ye-sodium carboxymethyl cellulose ichatshazelwa bubunzima bayo bemolekyuli, ukugxila, ubushushu kunye nexabiso le-pH, kwaye ixutywe ne-ethyl okanye i-carboxypropyl cellulose, i-gelatin, i-xanthan gum, i-carrageenan, i-guar gum, i-agar, i-alginate ye-sodium, i-pectin, i-gum arabic kunye nesitatshi kunye nezinto eziphuma kuzo zinokuhambelana kakuhle (oko kukuthi i-synergistic isiphumo).
Xa ixabiso le-pH liyi-7, i-viscosity yesisombululo se-sodium carboxymethyl cellulose iyona ephezulu, kwaye xa ixabiso le-pH liyi-4 ~ 11, lizinzile. I-Carboxymethylcellulose ngendlela yesinyithi yealkali kunye neetyuwa ze-ammonium zinyibilika emanzini. I-Divalent metal ions Ca2 +, Mg2 +, Fe2 + inokuchaphazela i-viscosity yayo. Iintsimbi ezinzima ezifana nesilivere, i-barium, i-chromium okanye i-Fe3 + inokwenza ukuba ikhuphe isisombululo. Ukuba i-concentration ye-ion ilawulwa, njengokongezwa kwe-agent ye-chelating citric acid, isisombululo esicacileyo sinokuqulunqwa, okubangelwa i-gum ethambileyo okanye enzima.
I-sodium carboxymethyl cellulose luhlobo lweselulosi yendalo, eyenziwa ngokubanzi nge-cotton linter okanye i-pulp yamaplanga njengezinto ezikrwada kwaye iphantsi kwe-etherification reaction kunye ne-monochloroacetic acid phantsi kweemeko ze-alkaline.
Ngokweenkcukacha zezinto eziluhlaza kunye nokutshintshwa kwe-hydroxyl hydrogen kwiyunithi ye-cellulose ye-D-glucose liqela le-carboxymethyl, iikhompawundi ze-polymer ezinyibilikayo zamanzi ezinamaqondo ahlukeneyo okutshintsha kunye nokusabalalisa ubunzima be-molecular bufumaneka.
Ngenxa yokuba i-sodium carboxymethyl cellulose ineempawu ezininzi ezikhethekileyo kunye nezigqwesileyo, isetyenziswa kakhulu kwishishini lemihla ngemihla lemichiza, ukutya kunye namayeza kunye nokunye ukuveliswa kwamashishini.
Esinye sezibonakaliso ezibalulekileyo ze-sodium carboxymethyl cellulose yi-viscosity ye-sodium carboxymethyl cellulose. Ixabiso le-viscosity lihambelana nezinto ezahlukeneyo ezifana nokugxila, ubushushu kunye nesantya sokucheba. Nangona kunjalo, izinto ezinje ngoxinaniso, ubushushu kunye nesantya sokucheba zizinto zangaphandle ezichaphazela i-viscosity ye-sodium carboxymethyl cellulose.
Ubunzima bayo be-molecular and distribution molecular zizinto zangaphakathi ezichaphazela i-viscosity ye-sodium carboxymethyl cellulose isisombululo. Kulawulo lwemveliso kunye nophuhliso lwentsebenzo yemveliso ye-sodium carboxymethyl cellulose, ukuphanda ubunzima bayo bemolekyuli kunye nokusabalalisa ubunzima bemolekyuli kunexabiso elibaluleke kakhulu lereferensi, ngelixa i-viscosity Umlinganiselo unokudlala indima ethile yokubhekisela.
Imithetho kaNewton kwi-rheology, nceda ufunde umxholo ofanelekileyo we "rheology" kwi-chemistry yomzimba, kunzima ukuchaza kwisivakalisi esinye okanye ezibini. Ukuba kufuneka utsho: kwisisombululo esincinci se-cmc kufuphi ne-Newtonian fluid, uxinzelelo lwe-shear lulingana nesantya sokusika, kwaye i-coefficient yokulinganisa phakathi kwabo ibizwa ngokuba yi-viscosity coefficient okanye i-kinematic viscosity.
I-Viscosity ivela kumandla phakathi kwamakhonkco e-cellulose eemolekyuli, kubandakanywa amandla okusasazwa kunye neebhondi ze-hydrogen. Ngokukodwa, i-polymerization ye-cellulose derivatives ayikho i-linear structure kodwa i-multi-branched structure. Kwisisombululo, iiselulosi ezininzi ezinamasebe amaninzi zidibene ukuze zenze isakhiwo senethiwekhi yendawo. Ukuqina kwesakhiwo, amandla amakhulu phakathi kwamatyathanga emolekyuli kwisisombululo esisiphumo.
Ukuvelisa ukuhamba kwisisombululo se-dilute ye-cellulose derivatives, amandla phakathi kwamaketanga e-molecular kufuneka anqotshwe, ngoko ke isisombululo esinomgangatho ophezulu we-polymerization sidinga amandla amakhulu okuvelisa ukuhamba. Ukulinganisa i-viscosity, amandla kwisisombululo se-CMC ngumxhuzulane. Ngaphantsi kwemeko ye-gravity eqhubekayo, isakhiwo sekhonkco yesisombululo se-CMC kunye neqondo elikhulu le-polymerization linamandla amakhulu, kwaye ukuhamba kuhamba kancane. Ukuhamba okucothayo kubonisa i-viscosity.
I-viscosity ye-sodium carboxymethyl cellulose inxulumene ikakhulu nobunzima bemolekyuli, kwaye ayinanto yakwenza nenqanaba lokutshintsha. Ubukhulu beqondo lokutshintshwa, ubunzima obukhulu bemolekyuli, kuba ubunzima bemolekyuli yeqela elifakwe endaweni ye-carboxymethyl bukhulu kuneqela langaphambili le-hydroxyl.
Ityuwa ye-sodium ye-cellulose carboxymethyl ether, i-anionic cellulose ether, imhlophe okanye i-milky emhlophe ye-fibrous powder okanye i-granule, kunye nobuninzi be-0.5-0.7 g / cm3, phantse iphunga, ingenancasa, kunye ne-hygroscopic. Kulula ukusasaza emanzini ukwenza isisombululo se-colloidal esicacileyo, kwaye ayinyibiliki kwii-solvents eziphilayo ezifana ne-ethanol. I-pH ye-1% yesisombululo se-aqueous yi-6.5 ukuya kwi-8.5. Xa i-pH> 10 okanye <5, i-viscosity ye-sodium carboxymethylcellulose iyancipha kakhulu, kwaye ukusebenza kuyona nto ingcono xa i-pH = 7.
Izinzile ngokushushu. I-viscosity inyuka ngokukhawuleza ngaphantsi kwe-20 ℃, kwaye itshintsha kancinci kwi-45 ℃. Ukufudumeza ixesha elide ngaphezu kwe-80 ℃ kunokunciphisa i-colloid kunye nokunciphisa i-viscosity kunye nokusebenza kakhulu. Inyibilika ngokulula emanzini, kwaye isisombululo siyabonakala; izinzile kakhulu kwisisombululo se-alkaline, kwaye kulula ukwenza i-hydrolyze phambi kwe-asidi. Xa ixabiso le-pH li-2-3, liya kunyuka.
Ixesha lokuposa: Nov-07-2022