1. spornroduction:
HydroxyPropyyl methylcellulose (HPMC) yog ib qho kev lag luam polymer ntau yam hauv kev lag luam, suav nrog cov tshuaj, kev tsim kho, thiab khoom noj. Ib qho ntawm nws daim ntawv thov tseem ceeb yog nyob rau hauv kev kho lub zog rheological ntawm kev ncua. Rheology, kev kawm kev ntws thiab deformation ntawm cov ntaub ntawv, yog qhov tseem ceeb hauv kev nkag siab thiab tswj hwm tus cwj pwm ntawm kev ncua.
2.Txhua kev hloov kho:
HPMC paub txog nws lub peev xwm los hloov lub viscosity ntawm kev ncua. Raws li hydrophilic polymer, nws tau yooj yim nqus dej thiab tsim cov gel zoo li cov qauv. Thaum ntxiv rau ncua kev kawm ntawv, HPMC lwg me me thiab entangle, nce viscosity ntawm lub system. Qhov raws li viscosity kev hloov kho yog nyob ntawm qhov xwm txheej xws li HPMC concentration, hnyav hnyav, thiab qib hloov chaw. Cov teeb meem ntau dua thiab hnyav hnyav ntawm HPMC feem ntau ua rau muaj ntau dua viscosity ntxiv.
3.Qhov-thinning tus cwj pwm:
Ntxiv rau kev hloov pauv viscosity, HPMC tuaj yeem cuam tshuam rau cov tshuaj khib nyiab ntawm kev ncua. Shear-thinning yog hais txog qhov txo qis hauv viscosity nyob rau hauv kev thov shear kev ntxhov siab, feem ntau tau pom nyob rau hauv ntau lub tshuab. Lub xub ntiag ntawm HPMC ALRASS tus cwj pwm ntws ntawm qhov kev ncua, ua kom muaj kev txhim kho shear-thinned cov khoom. Cov cuab yeej no yog qhov tshwj xeeb hauv cov ntawv thov uas yooj yim pouring lossis dispensing yog xav tau, xws li hauv cov tshuaj lossis khoom noj khoom haus.
4.Qhov stability stability:
Lwm qhov tseem ceeb ntawm rheology yog ncua kev ruaj khov, uas yog hais txog lub peev xwm ntawm cov lus kom cov dispersed thiab tawm tsam lub sijhawm. HPMC ua si lub luag haujlwm tseem ceeb hauv kev txhim kho kev kawm kom raug tshem tawm los ntawm ntau lub tshuab. Firstly, nws cov nyhuv tuab yuav pab hauv kev tiv thaiv particle sib txuas los ntawm nce lub viscosity ntawm cov theem txuas ntxiv. Thib ob, HPMC ua ib qho kev tiv thaiv ib puag ncig ib puag ncig cov khoom, txo kev cuam tshuam nrog kev sib cuam tshuam thiab kev sib sau ua ke. Tus cwj pwm no ua rau lub zog ruaj khov pab tswj cov homogeneity ntawm kev ncua.
5.Qhov ntawm HPMC cov khoom:
Kev cuam tshuam rawv ntawm HPMC ntawm kev ncua yog pawg los ntawm ob peb cov khoom tseem ceeb ntawm cov polymer. Molecular qhov hnyav cuam tshuam cov kev sib tw ntawm saw entanglement thiab, yog li, viscosity ua. Lub cev hnyav dua HPMC nyhav los ua kom muaj txiaj ntsig zoo dua kom raug ncua. Qib ntawm kev hloov pauv (DS), uas yog hais txog tus naj npawb ntawm hydroxypropyl thiab methoxy pawg ib pawg dab tsi, kuj cuam tshuam kev sib tw ua si. Cov nuj nqis DS ntau dua ua rau cov dej muaj zog thiab tuab cov gel tsim, ua rau viscosity ntau ntxiv.
6.Practical cov ntawv thov:
Lub zog rheological ntawm kev ncua kev hloov kho nrog HPMC pom cov ntawv thov thoob plaws thoob plaws ntau yam kev lag luam. Hauv cov yeeb yaj kiab kws tshuaj, HPMC tau siv los ua cov neeg sawv cev kom ntseeg tau tias cov kev faib tawm ntawm cov tshuaj thiab txhim kho kev ruaj ntseg. Hauv kev tsim kho cov khoom xws li kev coj tsis ncaj thiab grouts tag thiab grouts, hpmc txhim khu kev ua haujlwm, cov nplaum, thiab sag tsis kam. Ib yam li ntawd, hauv cov khoom noj xws li cov kua ntses, hnav khaub ncaws, thiab cov khoom noj siv mis, hpmc txhim kho kev ntxhib los mos, thiab cov duab paug, thiab qhov ncauj.
HydroxyPropyyl methylcellose (HPMC) yog ntau cov tshuaj polymer uas cuam tshuam ntau qhov kev ncua ntawm kev ncua. Nws lub peev xwm los hloov viscosity, txhim kho shear-thinning kev coj ua, thiab txhim kho kev kawm ruaj khov ua rau nws muaj txiaj ntsig ntxiv hauv ntau yam kev lag luam. Los ntawm kev nkag siab cov txheej txheem los ntawm kev sib cuam tshuam HPMC, cov kws tshawb nrhiav thiab cov kws tshawb fawb tau ua kom tau kev siv ua kom tau cov yam ntxwv xav tau ntau yam.
Lub Sijhawm Post: Lub Tsib Hlis-08-2024