1. Kev Taw Qhia:
Hydroxypropyl Methylcellulose (HPMC) yog ib qho polymer uas siv tau ntau yam hauv ntau yam lag luam, suav nrog tshuaj, kev tsim kho, thiab khoom noj. Ib qho ntawm nws cov ntawv thov tseem ceeb yog kev hloov kho cov khoom rheological ntawm cov tshuaj ncua. Rheology, kev kawm txog kev ntws thiab kev hloov pauv ntawm cov ntaub ntawv, yog qhov tseem ceeb hauv kev nkag siab thiab tswj tus cwj pwm ntawm cov tshuaj ncua.
2. Kev Hloov Kho Viscosity:
HPMC paub txog nws lub peev xwm los hloov kho qhov viscosity ntawm cov suspensions. Ua ib qho hydrophilic polymer, nws yooj yim nqus dej thiab tsim cov qauv zoo li gel. Thaum ntxiv rau hauv cov suspension, HPMC molecules hydrate thiab entangle, ua rau viscosity ntawm lub system nce. Qhov dav ntawm kev hloov kho viscosity nyob ntawm cov yam xws li HPMC concentration, molecular weight, thiab degree of substitution. Cov concentration siab dua thiab molecular weights ntawm HPMC feem ntau ua rau viscosity nce ntxiv.
3. Kev coj cwj pwm ua kom nyias nyias:
Ntxiv rau kev hloov pauv viscosity, HPMC tuaj yeem cuam tshuam rau tus cwj pwm shear-thinning ntawm cov khoom ncua. Shear-thinning hais txog qhov txo qis ntawm viscosity nyob rau hauv kev siv shear kev ntxhov siab, feem ntau pom hauv ntau lub tshuab ncua. Qhov muaj HPMC hloov pauv tus cwj pwm ntws ntawm cov khoom ncua, ua rau muaj cov yam ntxwv shear-thinning zoo dua. Cov yam ntxwv no yog qhov tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov uas xav tau yooj yim nchuav lossis faib, xws li hauv cov tshuaj lossis cov khoom noj.
4. Kev Ruaj Ntseg ntawm Kev Ncua:
Lwm yam tseem ceeb ntawm rheology yog kev ruaj khov ntawm kev ncua, uas yog hais txog lub peev xwm ntawm cov khoom me me kom nyob twj ywm thiab tiv taus kev poob dej dhau sijhawm. HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ruaj khov ntawm kev ncua los ntawm ntau txoj hauv kev. Ua ntej, nws cov nyhuv ua kom tuab pab tiv thaiv cov khoom me me los ntawm kev nce qhov viscosity ntawm theem txuas ntxiv mus. Qhov thib ob, HPMC tsim ib qho kev tiv thaiv ib puag ncig cov khoom me me, txo cov kev sib cuam tshuam ntawm cov khoom me me thiab kev sib sau ua ke. Lub tshuab ruaj khov steric no pab tswj qhov sib xws ntawm kev ncua.
5. Kev cuam tshuam ntawm HPMC Cov Khoom:
Qhov cuam tshuam ntawm HPMC rau kev ncua yog cuam tshuam los ntawm ntau yam khoom tseem ceeb ntawm cov polymer. Qhov hnyav molecular cuam tshuam rau qhov dav ntawm cov saw hlau entanglement thiab, yog li ntawd, viscosity txhim kho. Qhov hnyav molecular siab dua HPMC feem ntau muab viscosity ntau dua rau kev ncua. Qib ntawm kev hloov pauv (DS), uas yog hais txog tus lej ntawm hydroxypropyl thiab methoxy pawg ib chav glucose, kuj cuam tshuam rau tus cwj pwm rheological. Cov nqi DS siab dua ua rau muaj zog hydration thiab cov gel tuab dua, ua rau viscosity ntau dua.
6. Cov Ntawv Thov Ua Haujlwm:
Cov khoom rheological ntawm cov kev ncua hloov kho nrog HPMC pom cov ntawv thov dav dav thoob plaws ntau yam lag luam. Hauv cov tshuaj tsim, HPMC yog siv los ua tus neeg sawv cev ncua kom ntseeg tau tias muaj kev faib tawm ntawm cov tshuaj me me thiab txhim kho kev ruaj khov. Hauv cov ntaub ntawv tsim kho xws li cementitious mortars thiab grouts, HPMC txhim kho kev ua haujlwm, kev nplaum, thiab kev tiv thaiv sag. Ib yam li ntawd, hauv cov khoom noj xws li cov kua ntses, cov khaub ncaws hnav, thiab cov khoom noj mis nyuj, HPMC txhim kho kev ntxhib los mos, kev ruaj khov, thiab qhov ncauj.
Hydroxypropyl Methylcellulose (HPMC) yog ib qho polymer ntau yam uas muaj feem cuam tshuam rau cov khoom rheological ntawm cov tshuaj ncua. Nws lub peev xwm los hloov pauv viscosity, txhim kho tus cwj pwm shear-thinning, thiab txhim kho kev ruaj khov ntawm cov tshuaj ncua ua rau nws yog ib qho khoom siv muaj txiaj ntsig zoo hauv ntau yam lag luam. Los ntawm kev nkag siab txog cov txheej txheem uas HPMC cuam tshuam nrog cov tshuaj ncua, cov kws tshawb fawb thiab cov neeg tsim qauv tuaj yeem hloov kho nws siv kom ua tiav cov yam ntxwv rheological xav tau hauv ntau yam kev siv.
Lub sijhawm tshaj tawm: Tsib Hlis-08-2024