Hydroxyethylcellulose (HEC) yog nonionic, dej-soluble polymer muab tau los ntawm cellulose. Vim nws cov khoom tshwj xeeb rheological, nws feem ntau siv rau hauv ntau yam lag luam xws li tshuaj, tshuaj pleev ib ce thiab kev tsim kho. Ib qho ntawm cov khoom tseem ceeb ntawm hydroxyethyl cellulose yog nws cov viscosity, uas ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab nws cov kev ua tau zoo hauv ntau daim ntawv thov.
Viscosity yog ib qho kev ntsuas ntawm cov kua dej tsis kam ntws. Nyob rau hauv cov ntaub ntawv ntawm hydroxyethylcellulose, nws viscosity yog cuam tshuam los ntawm ntau yam, xws li concentration, kub thiab shear tus nqi. Kev nkag siab txog cov xwm txheej no yog qhov tseem ceeb rau kev txhim kho kev siv HEC hauv cov qauv sib txawv.
Lub viscosity ntawm hydroxyethylcellulose muaj zog nyob ntawm nws cov concentration hauv kev daws. Feem ntau, raws li HEC concentration nce, nws viscosity kuj nce. Qhov kev coj cwj pwm no yog ib yam ntawm cov kev daws teeb meem polymer thiab feem ntau piav qhia los ntawm cov qauv kev cai lij choj uas cuam tshuam txog viscosity rau concentration.
Kub kuj tseem muaj txiaj ntsig zoo rau viscosity ntawm hydroxyethyl cellulose daws. Feem ntau, viscosity txo nrog nce kub. Qhov ntsuas kub no yog qhov tseem ceeb rau cov ntawv thov uas cov ntaub ntawv yuav tsum tau hloov pauv hauv viscosity, xws li thaum tsim khoom lossis thaum siv rau ntau qhov chaw.
Shear rate yog lwm qhov tseem ceeb cuam tshuam rau viscosity ntawm hydroxyethyl cellulose. Shear rate yog hais txog tus nqi ntawm cov kua dej uas nyob ib sab txav mus rau ib leeg. Lub viscosity ntawm HEC cov kev daws teeb meem feem ntau nthuav tawm tus cwj pwm shear thinning, txhais tau hais tias raws li tus nqi shear nce, lub viscosity txo. Cov cuab yeej no muaj txiaj ntsig zoo hauv kev siv xws li txheej txheej thiab cov nplaum uas yooj yim rau kev thov.
Qhov hnyav molecular ntawm hydroxyethyl cellulose kuj txiav txim siab nws cov viscosity. Siab molecular hnyav HECs yuav muaj ntau dua viscosities ntawm ib tug muab concentration. Cov yam ntxwv no tseem ceeb heev thaum xaiv ib qib tshwj xeeb ntawm HEC rau ib daim ntawv thov tshwj xeeb.
Nyob rau hauv cov tshuaj formulations, hydroxyethylcellulose feem ntau yog siv los ua ib tug thickening tus neeg sawv cev nyob rau hauv daim ntawv ntawm qhov ncauj thiab tshuaj pleev ib ce. Lub viscosity ntawm HEC ua kom raug tshem tawm ntawm cov khoom thiab muab qhov xav tau sib xws rau kev siv tshuaj yooj yim. Tsis tas li ntawd, tus cwj pwm shear-thinning ntawm HEC tuaj yeem txhim kho kev sib kis ntawm cov tshuaj pleev ib ce.
Hauv kev lag luam tshuaj pleev ib ce, hydroxyethylcellulose yog siv ntau yam khoom, suav nrog tshuaj zawv plaub hau, tshuaj pleev thiab tshuaj pleev. Nws cov viscosity-hloov cov khoom pab txhim kho kev ruaj ntseg thiab kev ntxhib los mos ntawm cov formulations, yog li txhim kho tag nrho cov neeg siv kev paub.
Hauv kev tsim kho kev lag luam, hydroxyethylcellulose feem ntau yog siv los ua cov thickener hauv cov khoom siv cement. Lub viscosity ntawm HEC pab tswj qhov ntws thiab kev ua haujlwm ntawm cov khoom thaum siv. Qhov no yog qhov tshwj xeeb tshaj yog rau cov ntawv thov xws li cov nplais nplaum thiab grouts.
Lub viscosity ntawm hydroxyethyl cellulose yog ib qho tseem ceeb parameter cuam tshuam nws cov kev ua tau zoo nyob rau hauv ntau daim ntawv thov. Nkag siab txog yam uas cuam tshuam rau viscosity, xws li concentration, kub, thiab shear npaum li cas, yog ib qho tseem ceeb rau optimizing kev siv HEC nyob rau hauv ntau yam lag luam. Raws li ntau yam polymer, hydroxyethyl cellulose tseem ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua tau zoo ntawm ntau yam khoom hauv kev lag luam sib txawv.
Post lub sij hawm: Jan-25-2024