Carboxymethylcellulose (CMC) yog cov khoom siv ntxiv uas siv dav hauv ntau yam lag luam xws li zaub mov, tshuaj, ntawv ua, textiles, thiab mining. Nws yog muab los ntawm ntuj cellulose, uas muaj ntau nyob rau hauv cov nroj tsuag thiab lwm yam khoom lom. CMC yog cov dej-soluble polymer nrog cov khoom tshwj xeeb xws li viscosity, hydration, adhesion thiab adhesion.
Cov yam ntxwv ntawm CMC
CMC yog cellulose derivative uas yog tshuaj hloov kho los ntawm kev qhia carboxymethyl pawg rau hauv nws cov qauv. Qhov kev hloov kho no txhim kho cov solubility thiab hydrophilicity ntawm cellulose, yog li txhim kho kev ua haujlwm. Cov khoom ntawm CMC nyob ntawm seb nws qhov kev hloov pauv (DS) thiab qhov hnyav molecular (MW). DS txhais tau tias yog qhov nruab nrab ntawm cov carboxymethyl pawg ib chav tsev piam thaj hauv cov pob txha cellulose, thaum MW qhia txog qhov loj thiab kev faib tawm ntawm cov saw hlau polymer.
Ib qho ntawm cov khoom tseem ceeb ntawm CMC yog nws cov dej solubility. CMC yog yooj yim soluble nyob rau hauv dej, tsim ib tug viscous tov nrog pseudoplastic zog. Qhov kev coj tus cwj pwm rheological no tshwm sim los ntawm kev sib cuam tshuam ntawm kev sib cuam tshuam ntawm CMC molecules, ua rau txo qis hauv viscosity nyob rau hauv shear stress. 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 tus yam ntxwv tseem ceeb ntawm CMC yog nws lub peev xwm ua yeeb yaj kiab. CMC cov kev daws teeb meem tuaj yeem muab pov rau hauv cov yeeb yaj kiab uas muaj cov khoom siv zoo heev, pob tshab, thiab yooj yim. Cov yeeb yaj kiab no tuaj yeem siv los ua cov txheej txheem, laminates thiab ntim khoom.
Tsis tas li ntawd, CMC muaj kev sib raug zoo thiab kev sib raug zoo. Nws tsim kev sib raug zoo nrog ntau qhov chaw, suav nrog ntoo, hlau, yas thiab ntaub. Cov cuab yeej no tau coj mus rau kev siv CMC hauv kev tsim cov coatings, adhesives thiab inks.
CMC viscosity
Lub viscosity ntawm CMC cov kev daws teeb meem nyob ntawm ntau yam xws li concentration, DS, MW, kub, thiab pH. Feem ntau, CMC cov kev daws teeb meem nthuav tawm ntau dua viscosities ntawm ntau dua, DS, thiab MW. Viscosity kuj nce nrog txo qhov kub thiab pH.
Lub viscosity ntawm CMC cov kev daws teeb meem yog tswj los ntawm kev sib cuam tshuam ntawm cov saw hlau polymer thiab cov kuab tshuaj molecules hauv cov tshuaj. CMC molecules cuam tshuam nrog dej molecules los ntawm hydrogen bonds, tsim lub plhaub hydration nyob ib ncig ntawm lub polymer chains. Lub plhaub hydration no txo cov kev txav mus los ntawm cov saw hlau polymer, yog li ua kom cov viscosity ntawm cov tshuaj.
Tus cwj pwm rheological ntawm CMC cov kev daws teeb meem yog tus cwj pwm los ntawm cov nkhaus ntws, uas piav qhia txog kev sib raug zoo ntawm kev ntxhov siab shear thiab shear tus nqi ntawm cov tshuaj. CMC cov kev daws teeb meem nthuav tawm tus cwj pwm tsis yog-Newtonian ntws, uas txhais tau hais tias lawv cov viscosity hloov nrog tus nqi shear. Thaum qis shear tus nqi, viscosity ntawm CMC cov kev daws teeb meem yog siab dua, thaum lub siab shear tus nqi, lub viscosity txo. Qhov no shear thinning tus cwj pwm yog vim polymer chains aligning thiab stretching nyob rau hauv shear stress, uas ua rau txo intermolecular rog ntawm chains thiab ib tug txo nyob rau hauv viscosity.
Kev siv CMC
CMC tau siv dav hauv ntau qhov chaw vim nws cov khoom tshwj xeeb thiab tus cwj pwm rheological. Hauv kev lag luam zaub mov, CMC yog siv los ua cov thickener, stabilizer, emulsifier thiab kev ntxhib los mos. Nws yog ntxiv rau cov khoom noj xws li dej khov, dej qab zib, kua ntses thiab cov khoom ci los txhim kho lawv cov kev ntxhib los mos, sib xws thiab txee lub neej. CMC kuj tseem tiv thaiv kev tsim cov dej khov nab kuab hauv cov khoom noj khov, ua rau cov khoom lag luam zoo nkauj.
Hauv kev lag luam kws tshuaj, CMC yog siv los ua ib qho kev sib khi, disintegrant thiab tswj kev tso tawm tus neeg sawv cev hauv cov tshuaj ntsiav tshuaj. Txhim kho lub compressibility thiab fluidity ntawm cov hmoov thiab xyuas kom meej lub uniformity thiab stability ntawm cov ntsiav tshuaj. Vim nws cov mucoadhesive thiab bioadhesive zog, CMC kuj yog siv los ua ib qho excipient hauv ophthalmic, qhov ntswg, thiab qhov ncauj formulations.
Hauv kev lag luam ntawv, CMC yog siv los ua cov khoom siv ntub dej, txheej binder thiab sizing xovxwm tus neeg sawv cev. It improves pulp retention and drainage, increases paper strength and density, and provides a smooth and shiny surface. CMC kuj ua raws li dej thiab roj thaiv, tiv thaiv tus number case lossis lwm yam kua los ntawm kev nkag mus rau daim ntawv.
Hauv kev lag luam textile, CMC yog siv los ua tus neeg sawv cev sizing, luam ntawv thickener, thiab dyeing auxiliary. Nws txhim kho fiber ntau adhesion, txhim khu xim nkag mus thiab fixation, thiab txo kev sib txhuam thiab wrinkles. CMC kuj tseem muab cov softness thiab nruj rau cov ntaub, nyob ntawm DS thiab MW ntawm cov polymer.
Hauv kev lag luam mining, CMC yog siv los ua flocculant, inhibitor thiab rheology modifier hauv kev ua cov ntxhia. Nws txhim kho kev daws teeb meem thiab pom cov khib nyiab, txo qis kev sib cais los ntawm coal gangue, thiab tswj kev ncua viscosity thiab stability. CMC kuj txo cov kev cuam tshuam ib puag ncig ntawm cov txheej txheem mining los ntawm kev txo qis kev siv tshuaj lom thiab dej.
nyob rau hauv xaus
CMC yog ntau yam thiab muaj txiaj ntsig ntxiv uas nthuav tawm cov khoom tshwj xeeb thiab viscosity vim nws cov qauv tshuaj thiab kev cuam tshuam nrog dej. Nws solubility, film-forming muaj peev xwm, khi thiab adhesion zog ua rau nws haum rau txawv daim ntaub ntawv nyob rau hauv cov zaub mov, tshuaj, ntawv, textile thiab mining sectors. Lub viscosity ntawm CMC cov kev daws teeb meem tuaj yeem tswj tau los ntawm ntau yam, xws li concentration, DS, MW, kub, thiab pH, thiab tuaj yeem ua rau nws tus cwj pwm pseudoplastic thiab shear-thinning. CMC muaj kev cuam tshuam zoo rau qhov zoo, kev ua tau 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.
Post lub sij hawm: Sep-25-2023