Cellulose ether, tshwj xeeb tshaj yog hydroxypropyl methylcellulose (HPMC), yog ib qho tseem ceeb additive siv nyob rau hauv ntau yam industries rau nws siab thickening efficiency, siab dej tuav, thiab muaj peev xwm mus nce viscosity. Nyob rau hauv tsab xov xwm no, peb yuav delve rau hauv ib qho kev tsom xam ntawm cov thickening thiab thixotropy zog ntawm cellulose ether, tshwj xeeb tshaj yog tsom rau HPMC.
Thickening yog ib qho cuab yeej tseem ceeb ntawm cellulose ether, uas yog hais txog lub peev xwm ntawm ib yam khoom los ua kom cov viscosity ntawm cov tshuaj los yog dispersion. HPMC nthuav tawm cov thickening efficiency siab, txhais tau tias nws tuaj yeem ua rau kom cov viscosity nce ntxiv txawm tias muaj qhov tsawg tsawg. Cov cuab yeej no yog qhov xav tau nyob rau hauv ntau daim ntawv thov, xws li cov nplaum, txheej, thiab cov khoom siv tu tus kheej, qhov yuav tsum muaj viscosity ntau dua rau kev ua haujlwm zoo dua.
Ib qho txiaj ntsig tseem ceeb ntawm HPMC yog nws lub peev xwm khaws dej siab. Kev tuav dej yog hais txog lub peev xwm ntawm ib yam khoom kom khaws cov dej hauv lub cev, txawm tias nyob rau hauv qhov kub thiab txias los yog muaj lwm cov kuab tshuaj. HPMC tsim cov qauv zoo li gel thaum hydrated, uas pab khaws cov dej molecules thiab tiv thaiv cov evaporation ntau dhau. Cov cuab yeej no yog ib qho tseem ceeb tshwj xeeb hauv kev lag luam xws li kev tsim kho thiab cov khoom sib xyaw qhuav, qhov uas tswj cov dej noo yog qhov tseem ceeb rau kev ua dej kom zoo thiab kho cov ntaub ntawv.
Qhov nce viscosity muab los ntawm cellulose ether, xws li HPMC, muaj ntau yam txiaj ntsig hauv ntau daim ntawv thov. Hauv kev tsim kho kev lag luam, HPMC yog siv hauv cov cement-based formulations los txhim kho kev ua haujlwm thiab tiv thaiv kev sib cais. Lub siab viscosity ntawm HPMC kev daws teeb meem tso cai rau kev tswj kom zoo dua thaum lub sij hawm thov, kom ntseeg tau tias muaj kev sib kis zoo sib xws thiab tsis txhob muaj qhov teeb meem ntawm cov khoom. Ib yam li ntawd, hauv kev lag luam xim, HPMC tau ntxiv rau cov txheej txheem los txhim kho lawv cov viscosity, ua rau muaj kev tiv thaiv zoo dua thiab txo qis.
Tsis tas li ntawd, thixotropic xwm ntawm cellulose ether yog ib qho tseem ceeb uas yuav tau xav txog. Thixotropy yog hais txog cov cuab yeej ntawm cov khoom siv los nthuav tawm qhov hloov pauv hloov hauv viscosity thaum siv cov kev ntxhov siab shear. Hauv cov ntsiab lus yooj yim, thaum siv lub zog shear, cov khoom siv los ua cov kua nplaum tsawg, tso cai rau kev siv yooj yim, thiab thaum sawv ntsug, nws rov qab mus rau nws qhov qub siab viscosity. Cov cuab yeej no tau txais txiaj ntsig zoo hauv cov ntawv thov xws li caulks, sealants, thiab tshuaj pleev xim, qhov yooj yim dispensing thiab kis tau yooj yim. HPMC tus cwj pwm thixotropic ua kom daim ntawv thov yooj yim thiab ntub dej zoo ntawm qhov chaw, thaum tswj xyuas qhov tsim nyog viscosity rau adhesion thiab sealing zog.
Txhawm rau delve tob rau hauv cov thickening thiab thixotropy cov khoom ntawm cellulose ether, kev tshawb fawb dav dav thiab kev tshuaj xyuas yog ua. Ntau cov tswv yim, suav nrog kev ntsuas rheological, yog ua haujlwm los ntsuas qhov viscosity, shear stress, thiab thixotropic cwj pwm ntawm cellulose ether daws. Cov kev tshawb fawb no pab kom nkag siab txog kev sib raug zoo ntawm cov concentration, kub, thiab shear tus nqi ntawm cov thickening thiab thixotropy zog ntawm cellulose ether.
Hauv kev xaus, cellulose ether, tshwj xeeb yog HPMC, nthuav tawm qhov ua haujlwm siab tuab, khaws dej siab, thiab nce viscosity hauv ntau daim ntawv thov. Nws lub peev xwm los muab tus cwj pwm thixotropic ua rau nws muaj txiaj ntsig zoo rau cov khoom siv uas yooj yim thov thiab siab viscosity ib txhij. Txhawm rau kom tau txais kev nkag siab zoo ntawm cov thickening thiab thixotropy cov khoom ntawm cellulose ether, kev tshuaj xyuas thiab kev tshawb fawb dav dav tau ua, uas ntxiv txhim kho nws cov ntawv thov kev lag luam.
Post lub sij hawm: Nov-24-2023