Hydroxypropyl methyl cellulose tuaj yeem txhim kho qhov tsis sib haum ntawm cov cement mortar

Hydroxypropyl methyl cellulose tuaj yeem txhim kho qhov tsis sib haum ntawm cov cement mortar

Hydroxypropyl methyl cellulose (HPMC)yog ib qho khoom siv polymer feem ntau siv hauv ntau yam lag luam, suav nrog kev tsim kho, tshuaj, thiab zaub mov. Hauv thaj chaw ntawm kev tsim kho, tshwj xeeb hauv kev siv cov cement mortar, HPMC plays lub luag haujlwm tseem ceeb hauv kev txhim kho ntau yam khoom, nrog rau kev tsis sib haum xeeb.

1.Kev nkag siab txog Hydroxypropyl Methyl Cellulose (HPMC):

Chemical Structure:
HPMC yog cellulose derivative muab los ntawm ntuj cellulose los ntawm kev hloov tshuaj. Nws cov qauv muaj xws li rov qab cov piam thaj txuas ua ke, nrog cov methyl thiab hydroxypropyl pawg txuas rau qee pawg hydroxyl ntawm cov piam thaj. Cov qauv tshuaj no nthuav tawm cov khoom tshwj xeeb rau HPMC, ua rau nws soluble hauv dej thiab muaj peev xwm tsim cov kua dej khov.

https://www.ihpmc.com/

Lub cev muaj zog:
Dej Solubility: HPMC yog soluble hauv dej, tsim cov tshuaj colloidal nrog viscosity siab.
Zaj duab xis-Forming Muaj peev xwm: Nws tuaj yeem tsim cov duab pob tshab, hloov tau yooj yim thaum ziab, uas ua rau nws ua tau zoo raws li kev sib khi thiab zaj duab xis qub.
Thermal Stability: HPMC nthuav tawm kev ruaj ntseg ntawm ntau qhov kub thiab txias, ua rau nws haum rau ntau yam kev siv, suav nrog cov hauv kev tsim kho.

2.Kev thov ntawm HPMC hauv Cement Mortar:

Kev Txhim Kho Dispersion Resistance:
Txhim Kho Kev Ua Haujlwm Zoo: Kev sib ntxiv ntawm HPMC rau cov cement mortar ua rau nws ua haujlwm tau zoo los ntawm kev txhim kho dej tuav. Qhov no ua rau muaj kev sib xyaw ua ke ntau dua thiab zoo ib yam, ua kom yooj yim rau kev thov thiab kev siv zog thaum tsim kho.
Txo kev sib cais thiab los ntshav: HPMC ua raws li kev sib khi, tiv thaiv kev sib cais ntawm cov dej los ntawm cov cement mortar sib tov. Qhov no txo ​​qis kev sib cais thiab los ntshav, yog li txhim kho cov cohesion thiab tag nrho stability ntawm lub mortar.
Txhim kho Adhesion: Cov yeeb yaj kiab-tsim cov khoom ntawm HPMC pab txhawb kom zoo dua adhesion ntawm cov mortar thiab substrate nto, ua rau txhim khu kev ruaj ntseg thiab ruaj khov ntawm cov khoom tsim.
Lub Sijhawm Tswjhwm: HPMC tuaj yeem cuam tshuam lub sijhawm teem sijhawm ntawm cov cement mortar, muab kev hloov pauv hauv cov sijhawm tsim kho thiab tso cai rau kev tswj hwm zoo dua ntawm cov txheej txheem thov.

Mechanisms ntawm Action:
Kev Tswj Dej: HPMC molecules cuam tshuam nrog cov dej molecules, tsim cov txheej tiv thaiv ib puag ncig cov cement. Qhov no tiv thaiv cov txheej txheem hydration ntawm cov cement, tiv thaiv ntxov ntxov stiffening thiab tso cai rau kev ua haujlwm ntev.
Particle Dispersion: Lub hydrophilic xwm ntawm HPMC ua rau nws tawg tusyees thoob plaws hauv lub mortar sib tov, txhawb kev sib faib ntawm cov cement hais. Qhov kev sib cais tsis sib xws no txhim kho qhov sib xws thiab lub zog ntawm mortar.
Zaj duab xis tsim: Thaum ziab,HPMCtsim ib zaj duab xis nyias saum npoo ntawm lub mortar, zoo khi cov khoom ua ke. Cov yeeb yaj kiab no ua rau muaj kev cuam tshuam rau kev nkag mus ntawm cov dej noo thiab tshuaj lom neeg tawm tsam, txhim kho cov kav ntev thiab tsis kam ntawm cov tshuaj khib rau ib puag ncig yam.

Hydroxypropyl methyl cellulose (HPMC) ua hauj lwm raws li ib tug multifunctional additive nyob rau hauv cement mortar formulations, muab ntau yam kev pab cuam, nrog rau kev txhim kho dispersion kuj. Nws cov khoom tshwj xeeb, xws li dej solubility, muaj peev xwm ua zaj duab xis, thiab thermal stability, ua rau nws yog ib qho tseem ceeb hauv kev tsim kho niaj hnub. Los ntawm kev txhim kho kev ua haujlwm, kev ua kom zoo, thiab kev ua haujlwm tag nrho, HPMC pab txhawb rau kev tsim cov khoom zoo thiab ruaj khov cement mortar, ua tau raws li qhov xav tau ntawm kev tsim kho kev lag luam.


Post lub sij hawm: Apr-12-2024