1. Taw qhia:
Hydroxypropyl Methylcellulose (HPMC) yog cov khoom siv hluav taws xob ntau yam siv dav hauv ntau lub lag luam, suav nrog kev siv tshuaj, kev tsim kho, thiab khoom noj. Ib qho ntawm nws cov ntawv thov tseem ceeb yog hloov kho cov khoom rheological ntawm kev ncua. Rheology, kev kawm txog kev ntws thiab deformation ntawm cov ntaub ntawv, yog qhov tseem ceeb hauv kev nkag siab thiab tswj tus cwj pwm ntawm kev ncua.
2. Viscosity Hloov Kho:
HPMC paub txog nws lub peev xwm los hloov cov viscosity ntawm kev ncua. Raws li hydrophilic polymer, nws yooj yim nqus dej thiab tsim cov qauv zoo li gel. Thaum ntxiv rau kev ncua, HPMC molecules hydrate thiab entangle, ua rau cov viscosity ntawm lub kaw lus. Qhov kev hloov pauv viscosity nyob ntawm seb yam xws li HPMC concentration, molecular hnyav, thiab qib hloov pauv. Qhov siab dua thiab qhov hnyav molecular ntawm HPMC feem ntau ua rau muaj viscosity ntau dua.
3.Shear-Thinning Cwj Pwm:
Ntxiv nrog rau kev hloov kho viscosity, HPMC tuaj yeem cuam tshuam tus cwj pwm shear-thinning ntawm kev ncua. Shear-thinning yog hais txog qhov txo qis hauv viscosity raws li kev siv shear kev nyuaj siab, feem ntau pom nyob rau hauv ntau lub tshuab ncua kev kawm ntawv. Lub xub ntiag ntawm HPMC hloov pauv tus cwj pwm coj tus cwj pwm ntawm kev ncua, ua rau txhim kho shear-thinning zog. Cov cuab yeej no muaj txiaj ntsig tshwj xeeb hauv cov ntawv thov uas xav tau yooj yim nchuav lossis xa tawm, xws li hauv cov tshuaj formulations lossis khoom noj khoom haus.
4.Kev ruaj ntseg:
Lwm qhov tseem ceeb ntawm rheology yog kev ncua kev ruaj ntseg, uas yog hais txog lub peev xwm ntawm cov khoom kom nyob twj ywm dispersed thiab tiv thaiv sedimentation lub sij hawm. HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ncua kev ruaj ntseg los ntawm ntau lub tshuab. Ua ntej, nws cov nyhuv thickening pab tiv thaiv cov khoom me me los ntawm kev ua kom cov viscosity ntawm cov theem tas mus li. Qhov thib ob, HPMC tsim kev tiv thaiv ib puag ncig ntawm cov khoom, txo cov kev sib cuam tshuam thiab kev sib sau ua ke. Qhov no steric stabilization mechanism pab tswj lub homogeneity ntawm kev ncua.
5.Influence ntawm HPMC Properties:
Qhov cuam tshuam rheological ntawm HPMC ntawm kev ncua yog cuam tshuam los ntawm ntau yam khoom tseem ceeb ntawm cov polymer. Qhov hnyav ntawm molecular cuam tshuam rau qhov kev sib txuas ntawm cov saw hlau thiab, yog li ntawd, kev txhim kho viscosity. Lub cev hnyav dua molecular HPMC nyiam muab cov viscosity ntau dua rau kev ncua. Degree ntawm kev hloov pauv (DS), uas yog hais txog tus naj npawb ntawm hydroxypropyl thiab methoxy pawg hauv ib chav tsev, kuj cuam tshuam rau tus cwj pwm rheological. Cov txiaj ntsig DS siab dua ua rau muaj zog hydration thiab thicker gel tsim, ua rau muaj zog viscosity.
6. Kev siv tswv yim:
Cov khoom rheological ntawm kev ncua kev hloov pauv nrog HPMC pom cov ntawv thov thoob plaws ntau yam kev lag luam. Hauv cov tshuaj formulations, HPMC yog siv los ua tus neeg sawv cev ncua los xyuas kom meej kev faib cov tshuaj sib txawv thiab txhim khu kev ruaj ntseg. Hauv kev tsim cov ntaub ntawv xws li cementitious mortars thiab grouts, HPMC txhim kho kev ua haujlwm, adhesion, thiab sag kuj. Ib yam li ntawd, hauv cov khoom noj xws li kua ntses, hnav khaub ncaws, thiab cov khoom siv mis nyuj, HPMC txhim kho kev ntxhib los mos, ruaj khov, thiab qhov ncauj.
Hydroxypropyl Methylcellulose (HPMC) yog ib qho khoom siv ntau yam polymer uas cuam tshuam rau rheological zog ntawm kev ncua. Nws muaj peev xwm hloov kho viscosity, txhim kho shear-thinning tus cwj pwm, thiab txhim kho kev ncua kev ruaj ntseg ua rau nws muaj txiaj ntsig zoo ntxiv hauv ntau yam lag luam. Los ntawm kev nkag siab txog cov txheej txheem los ntawm HPMC cuam tshuam nrog kev ncua, cov kws tshawb fawb thiab cov kws tsim qauv tuaj yeem tsim kho nws txoj kev siv kom ua tiav cov yam ntxwv rheological hauv ntau hom kev siv.
Post lub sij hawm: May-08-2024