Hydroxyethylcellulose (HEC) yog ib qho polymer uas tsis yog ionic, yaj tau hauv dej los ntawm cellulose. Vim nws cov khoom rheological tshwj xeeb, nws feem ntau siv rau hauv ntau yam lag luam suav nrog 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 rau kev ntws. Hauv cov ntaub ntawv ntawm hydroxyethylcellulose, nws cov viscosity raug cuam tshuam los ntawm ntau yam, suav nrog kev sib xyaw, kub thiab shear rate. Kev nkag siab txog cov yam no yog qhov tseem ceeb rau kev siv HEC hauv cov qauv sib txawv.
Qhov viscosity ntawm hydroxyethylcellulose nyob ntawm nws qhov concentration hauv cov kua. Feem ntau, thaum HEC concentration nce, nws qhov viscosity kuj nce. Tus cwj pwm no yog ib txwm muaj ntawm cov tshuaj polymer thiab feem ntau piav qhia los ntawm tus qauv cai fais fab uas cuam tshuam txog viscosity rau concentration.
Qhov kub kuj muaj feem cuam tshuam loj rau qhov viscosity ntawm hydroxyethyl cellulose cov kua. Feem ntau, viscosity txo qis nrog rau qhov kub nce. Qhov kev rhiab heev ntawm qhov kub no yog qhov tseem ceeb rau cov ntawv thov uas cov ntaub ntawv xav tau kev hloov pauv hauv viscosity, xws li thaum lub sijhawm tsim khoom lossis thaum siv rau ntau qhov chaw sib txawv.
Tus nqi shear yog lwm yam tseem ceeb uas cuam tshuam rau qhov viscosity ntawm hydroxyethyl cellulose. Tus nqi shear yog hais txog tus nqi uas cov kua dej sib ze txav mus rau ib leeg. Lub viscosity ntawm HEC cov kev daws teeb meem feem ntau qhia txog tus cwj pwm shear thinning, txhais tau tias thaum tus nqi shear nce ntxiv, qhov viscosity txo qis. Cov cuab yeej no yog qhov zoo rau cov ntawv thov xws li cov txheej thiab cov nplaum uas yooj yim siv.
Qhov hnyav molecular ntawm hydroxyethyl cellulose kuj txiav txim siab nws cov viscosity. Cov HECs hnyav molecular siab dua feem ntau muaj viscosities siab dua ntawm qhov concentration. Cov yam ntxwv no tseem ceeb thaum xaiv qib tshwj xeeb ntawm HEC rau ib daim ntawv thov tshwj xeeb.
Hauv cov tshuaj formulations, hydroxyethylcellulose feem ntau yog siv los ua tus neeg sawv cev thickening hauv cov ntawv noj thiab tshuaj pleev. Lub viscosity ntawm HEC ua kom muaj kev ncua ntawm cov khoom me me thiab muab qhov sib xws rau kev yooj yim dosing. Ntxiv mus, tus cwj pwm shear-thinning ntawm HEC tuaj yeem txhim kho qhov kis tau ntawm cov tshuaj pleev.
Hauv kev lag luam tshuaj pleev ib ce, hydroxyethylcellulose siv rau hauv ntau yam khoom, suav nrog cov tshuaj zawv plaub hau, tshuaj pleev, thiab tshuaj pleev. Nws cov khoom hloov pauv viscosity pab txhim kho qhov ruaj khov thiab cov qauv ntawm cov mis no, yog li txhim kho qhov kev paub ntawm tus neeg siv tag nrho.
Hauv kev lag luam kev tsim kho, hydroxyethylcellulose feem ntau siv los ua cov khoom siv tuab hauv cov khoom siv cement. Qhov viscosity ntawm HEC pab tswj kev ntws thiab kev ua haujlwm ntawm cov khoom siv thaum lub sijhawm thov. Qhov no tseem ceeb heev rau cov ntawv thov xws li cov nplaum pobzeb thiab cov grouts.
Qhov viscosity ntawm hydroxyethyl cellulose yog ib qho tseem ceeb parameter uas cuam tshuam rau nws cov kev ua tau zoo hauv ntau daim ntawv thov. Kev nkag siab txog cov yam ntxwv uas cuam tshuam rau viscosity, xws li concentration, kub, thiab shear rate, yog qhov tseem ceeb rau kev siv HEC hauv ntau yam lag luam. Raws li ib qho polymer ntau yam, hydroxyethyl cellulose tseem ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua tau zoo ntawm ntau yam khoom thoob plaws ntau yam lag luam.
Lub sijhawm tshaj tawm: Lub Ib Hlis-25-2024