Hydroxypropyl Methylcellulose (HPMC) yog ib qho khoom siv ntau yam uas feem ntau siv rau hauv cov nplais nplaum thiab grouts rau nws lub peev xwm los txhim kho kev ua haujlwm thiab kev ua haujlwm. Nws cov khoom ua rau muaj ntau yam ntawm cov nplaum thiab cov txheej txheem grouting, cuam tshuam rau cov khoom xws li kev sib khi lub zog, dej tuav, qhib lub sijhawm, sag tsis kam, thiab tag nrho cov kav ntev. Kev nkag siab tias HPMC ua haujlwm li cas hauv cov ntaub ntawv no yuav tsum tau nkag mus rau hauv nws cov qauv tshuaj, nws cov kev cuam tshuam nrog dej, thiab nws lub luag haujlwm hauv cov txheej txheem nplaum thiab grouting.
Chemical Structure ntawm HPMC:
HPMC yog cellulose ether muab los ntawm ntuj cellulose, polysaccharide pom nyob rau hauv cov nroj tsuag.
Nws cov qauv tshuaj muaj xws li cellulose caj qaum chains nrog hydroxypropyl thiab methyl substituents.
Qib ntawm kev hloov pauv (DS) ntawm cov pab pawg no txiav txim siab txog cov yam ntxwv ntawm HPMC, suav nrog nws cov solubility, dej tuav, thiab tus cwj pwm rheological.
Kev tuav dej:
HPMC muaj kev sib raug zoo rau cov dej vim nws qhov hydrophilic, tsim hydrogen bonds nrog dej molecules.
Hauv cov nplais nplaum nplaum, HPMC ua tus neeg saib xyuas dej, ua kom lub sijhawm qhib ntawm cov nplaum.
Lub sijhawm qhib txuas ntxiv no tso cai rau kev ua haujlwm zoo dua thiab txhim kho adhesion los ntawm kev tiv thaiv kom qhuav ntxov ntxov ntawm cov nplaum.
Txhim kho kev ua haujlwm:
Lub xub ntiag ntawm HPMC nyob rau hauv cov pobzeb nplaum thiab grouts txhim kho lawv cov kev ua haujlwm los ntawm kev txhim kho lawv cov khoom rheological.
HPMC ua cov thickener thiab stabilizer, imparting pseudoplastic cwj pwm rau cov nplaum los yog grout.
Qhov pseudoplasticity no txo qis sagging los yog slumping thaum lub sij hawm thov, kom ntseeg tau zoo dua kev pab them nqi thiab uniformity.
Enhanced Bonding Strength:
HPMC pab txhawb kev sib txuas ntawm cov pobzeb nplaum los ntawm kev txhim kho kev sib cuag ntawm cov nplaum thiab cov substrate.
Nws cov dej tuav cov khoom kom muaj dej txaus ntawm cov ntaub ntawv cementitious, txhawb kev kho kom zoo thiab adhesion.
Tsis tas li ntawd, HPMC tuaj yeem hloov kho microstructure ntawm cov nplaum, txhim kho nws cov khoom siv dag zog thiab cov nplaum nplaum.
Sag Resistance:
Lub pseudoplastic xwm ntawm HPMC imparts thixotropic cwj pwm rau cov pobzeb adhesives thiab grouts.
Thixotropy hais txog cov cuab yeej ua kom tsis tshua muaj kuab paug nyob rau hauv kev nyuaj siab shear thiab rov qab mus rau siab dua viscosity thaum qhov kev ntxhov siab raug tshem tawm.
Qhov kev coj cwj pwm thixotropic no txhim kho sag tsis kam thaum daim ntawv thov ntsug, tiv thaiv cov nplaum los yog grout los ntawm zawv zawg rau hauv substrate ua ntej kho.
Durability thiab Performance:
HPMC txhim kho cov kav ntev thiab kev ua haujlwm ntawm cov nplais nplaum thiab cov nplaum los ntawm kev muab cov dej ua kom zoo dua qub thiab txo qis.
Nws cov dej tuav cov cuab yeej txo cov kev pheej hmoo ntawm kev ziab ntxov ntxov thiab shrinkage tawg, uas ua rau muaj kev ruaj khov thiab kav ntev.
HPMC tuaj yeem pab txhawb rau kev tsim cov ntom thiab cov teeb tsa microstructures, txuas ntxiv txhim kho qhov tsis kam rau noo noo thiab kev ntxhov siab txhua yam.
Hydroxypropyl Methylcellulose (HPMC) plays lub luag haujlwm tseem ceeb hauv cov pobzeb nplaum thiab cov nplaum los ntawm kev txhim kho lawv cov kev ua haujlwm, kev sib txuas lub zog, sag kuj, thiab kav ntev. Nws cov dej tuav cov khoom, ua ke nrog nws cov teebmeem rheological, ua rau nws yog ib qho tseem ceeb ntxiv rau kev ua tau zoo thiab kev ua haujlwm zoo hauv cov pobzeb.
Post lub sij hawm: May-24-2024