Carboxymethylcellulose (CMC) yog ib qho khoom siv ntxiv uas siv dav hauv ntau yam lag luam xws li khoom noj, tshuaj, ntawv, textiles, thiab kev khawb av. Nws yog los ntawm cov cellulose ntuj, uas muaj ntau nyob rau hauv cov nroj tsuag thiab lwm yam khoom siv biological. CMC yog ib qho polymer soluble hauv dej nrog cov khoom tshwj xeeb xws li viscosity, hydration, adhesion thiab adhesion.
Cov yam ntxwv ntawm CMC
CMC yog ib qho cellulose derivative uas tau hloov kho los ntawm kev qhia cov carboxymethyl pawg rau hauv nws cov qauv. Qhov kev hloov kho no ua rau kom muaj kev yaj thiab hydrophilicity ntawm cellulose, yog li txhim kho kev ua haujlwm. Cov khoom ntawm CMC nyob ntawm nws qib kev hloov pauv (DS) thiab qhov hnyav molecular (MW). DS yog txhais tias yog tus lej nruab nrab ntawm cov carboxymethyl pawg ib chav glucose hauv cellulose backbone, thaum MW qhia txog qhov loj me thiab kev faib tawm ntawm cov saw polymer.
Ib qho ntawm cov yam ntxwv tseem ceeb ntawm CMC yog nws cov dej solubility. CMC yooj yim soluble hauv dej, tsim cov kua nplaum nrog cov khoom pseudoplastic. Qhov kev coj cwj pwm rheological no yog los ntawm kev sib cuam tshuam ntawm cov molecules CMC, ua rau qhov txo qis hauv viscosity nyob rau hauv shear stress. Lub pseudoplastic xwm ntawm CMC cov kev daws teeb meem ua rau lawv haum rau ntau yam kev siv xws li thickeners, stabilizers, thiab suspending agents.
Lwm yam tseem ceeb ntawm CMC yog nws lub peev xwm tsim zaj duab xis. Cov tshuaj CMC tuaj yeem raug pov rau hauv cov zaj duab xis uas muaj cov khoom siv kho tshuab zoo heev, pob tshab, thiab yooj ywm. Cov zaj duab xis no tuaj yeem siv ua cov txheej txheej, laminates thiab cov ntaub ntawv ntim khoom.
Tsis tas li ntawd xwb, CMC muaj cov khoom sib txuas zoo thiab sib txuas tau zoo. Nws tsim cov khoom sib txuas zoo nrog ntau qhov chaw, suav nrog ntoo, hlau, yas thiab ntaub. Cov khoom no tau ua rau siv CMC hauv kev tsim cov tshuaj pleev xim, cov nplaum thiab cov kua mem.
CMC viscosity
Qhov viscosity ntawm CMC cov kua dej nyob ntawm ntau yam xws li concentration, DS, MW, kub, thiab pH. Feem ntau, CMC cov kua dej qhia tau tias muaj viscosities siab dua ntawm cov concentration siab dua, DS, thiab MW. Viscosity kuj nce ntxiv nrog rau qhov txo qis kub thiab pH.
Qhov viscosity ntawm CMC cov kua yog tswj los ntawm kev sib cuam tshuam ntawm cov saw polymer thiab cov tshuaj solvent hauv cov kua. CMC molecules sib cuam tshuam nrog cov dej molecules los ntawm hydrogen bonds, tsim ib lub plhaub hydration nyob ib puag ncig cov saw polymer. Lub plhaub hydration no txo qhov kev txav mus los ntawm cov saw polymer, yog li ua rau qhov viscosity ntawm cov kua nce ntxiv.
Tus cwj pwm rheological ntawm CMC cov kua yog tus cwj pwm los ntawm cov kab ntws, uas piav qhia txog kev sib raug zoo ntawm kev ntxhov siab shear thiab shear rate ntawm cov kua. CMC cov kua qhia txog tus cwj pwm ntws tsis-Newtonian, uas txhais tau tias lawv cov viscosity hloov pauv nrog shear rate. Ntawm cov shear rates qis, qhov viscosity ntawm CMC cov kua yog siab dua, thaum ntawm cov shear rates siab, qhov viscosity txo qis. Qhov kev coj cwj pwm shear thinning no yog vim cov saw polymer sib phim thiab ncab hauv qab kev ntxhov siab shear, ua rau cov zog intermolecular txo qis ntawm cov saw thiab txo qis viscosity.
Daim ntawv thov ntawm CMC
CMC siv dav hauv ntau qhov chaw sib txawv vim nws cov khoom tshwj xeeb thiab tus cwj pwm rheological. Hauv kev lag luam zaub mov, CMC siv ua cov khoom ua kom tuab, stabilizer, emulsifier thiab texture improver. Nws yog ntxiv rau cov khoom noj xws li ice cream, dej haus, kua ntses thiab cov khoom ci kom txhim kho lawv cov qauv, kev sib xws thiab lub txee lub neej. CMC kuj tiv thaiv kev tsim cov dej khov crystals hauv cov khoom noj khov, ua rau cov khoom du thiab creamy.
Hauv kev lag luam tshuaj, CMC siv ua tus binder, disintegrant thiab tswj kev tso tawm hauv cov qauv tshuaj ntsiav. Txhim kho qhov compressibility thiab fluidity ntawm cov hmoov thiab xyuas kom meej qhov sib xws thiab ruaj khov ntawm cov ntsiav. Vim nws cov mucoadhesive thiab bioadhesive zog, CMC kuj tseem siv ua ib qho excipient hauv ophthalmic, qhov ntswg, thiab qhov ncauj formulations.
Hauv kev lag luam ntawv, CMC siv ua cov khoom ntxiv rau qhov ntub, cov khoom nplaum txheej thiab cov khoom siv nias kom loj. Nws txhim kho kev khaws cia thiab ntws ntawm cov pulp, ua rau daim ntawv muaj zog thiab ntom dua, thiab muab qhov chaw du thiab ci ntsa iab. CMC kuj ua haujlwm ua cov dej thiab roj thaiv, tiv thaiv cov kua mem lossis lwm yam kua kom tsis txhob nkag mus rau hauv daim ntawv.
Hauv kev lag luam textile, CMC siv ua tus neeg sawv cev rau qhov loj me, ua kom tuab ntawm cov ntawv luam tawm, thiab ua kom zas xim. Nws txhim kho kev sib txuas ntawm cov fiber, ua kom cov xim nkag mus thiab kho tau zoo dua, thiab txo qhov sib txhuam thiab qhov ntsws. CMC kuj ua rau cov ntaub mos thiab tawv, nyob ntawm DS thiab MW ntawm cov polymer.
Hauv kev lag luam tsuas, CMC siv ua flocculant, inhibitor thiab rheology modifier hauv kev ua cov khoom siv hauv cov pob zeb. Nws txhim kho kev sib sau ua ke thiab kev lim dej ntawm cov khoom khov, txo qhov kev sib cais ntawm cov thee gangue, thiab tswj cov viscosity thiab kev ruaj khov ntawm cov khoom siv. CMC kuj txo qhov cuam tshuam rau ib puag ncig ntawm cov txheej txheem tsuas los ntawm kev txo qis kev siv cov tshuaj lom thiab dej.
xaus lus
CMC yog ib yam khoom siv uas muaj txiaj ntsig thiab muaj txiaj ntsig zoo uas muaj cov yam ntxwv tshwj xeeb thiab viscosity vim nws cov qauv tshuaj thiab kev sib cuam tshuam nrog dej. Nws cov solubility, lub peev xwm tsim zaj duab xis, kev khi thiab kev nplaum ua rau nws haum rau ntau yam kev siv hauv cov khoom noj, tshuaj, ntawv, textile thiab kev tsuas. Qhov viscosity ntawm CMC cov tshuaj tuaj yeem tswj tau los ntawm ntau yam, xws li concentration, DS, MW, kub, thiab pH, thiab tuaj yeem piav qhia los ntawm nws cov cwj pwm pseudoplastic thiab shear-thinning. CMC muaj qhov cuam tshuam zoo rau qhov zoo, kev ua haujlwm zoo thiab kev ruaj khov ntawm cov khoom thiab cov txheej txheem, ua rau nws yog ib feem tseem ceeb ntawm kev lag luam niaj hnub no.
Lub sijhawm tshaj tawm: Cuaj hlis-25-2023