Hydroxypropyl Methylcellulose (HPMC) yog non-ionic cellulose ether derivative siv dav hauv cov khoom siv cement vim nws cov khoom muaj txiaj ntsig. Cov khoom siv ntau yam no ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm thiab kev ua haujlwm ntawm cov ntaub ntawv no. Nov yog cov txiaj ntsig tseem ceeb ntawm kev siv HPMC hauv cov khoom siv cement, tawg ua ntau pawg:
1. Txhim kho kev ua haujlwm
HPMC txhim khu kev ua haujlwm ntawm cov khoom siv cement. Nws ua raws li tus neeg sawv cev tuav dej thiab hloov kho rheology, uas pab ua kom tiav qhov sib luag thiab yooj yim rau kev thov. Cov cuab yeej no muaj txiaj ntsig tshwj xeeb hauv cov khoom xws li pobzeb adhesives, mortars, thiab plasters.
Kev tuav dej: HPMC lub peev xwm khaws cov dej kom ntseeg tau tias qhov sib tov tseem ua haujlwm tau ntev dua. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog nyob rau hauv cov huab cua kub lossis ib puag ncig uas cov dej evaporation sai tuaj yeem ua rau muaj kev teeb tsa ntxov ntxov thiab txo qis kev ua haujlwm.
Kev Hloov Kho Rheology: Los ntawm kev hloov kho cov viscosity ntawm cov khoom sib xyaw, HPMC muab kev tswj hwm ntau dua thiab sib xyaw ua ke, ua kom yooj yim rau kev sib kis thiab siv sib npaug.
2. Txhim kho Adhesion
HPMC txhim kho cov khoom nplaum ntawm cov khoom siv cement. Qhov no yog qhov tseem ceeb heev rau cov ntawv thov xws li cov nplais nplaum thiab kho cov mortars, qhov twg muaj zog adhesion rau substrates yog qhov tseem ceeb.
Surface Bonding: Cov cuab yeej ua yeeb yaj kiab ntawm HPMC pab txhawb kev sib raug zoo ntawm ntau yam substrates, suav nrog pob zeb, cib, thiab cov vuas luaj.
Shear Strength: Txhim kho adhesion ua rau muaj zog shear ntau dua, uas yog qhov tseem ceeb rau kev ua haujlwm ntev thiab ntev ntawm cov khoom siv.
3. Kev tuav dej thiab kho
Kev kho kom zoo ntawm cov khoom siv cement yog qhov tseem ceeb rau kev ua tiav lub zog siab tshaj plaws thiab kav ntev. HPMC cov khoom tuav dej ua lub luag haujlwm tseem ceeb hauv qhov no.
Hydration: Los ntawm khaws cov dej hauv cov cement sib tov, HPMC ua kom tiav cov dej ntawm cov cement, ua rau kev kho kom zoo thiab txhim kho lub zog siab tshaj plaws.
Txo Cracking: Kev kho kom zoo yuav txo tau cov kab nrib pleb uas tshwm sim los ntawm kev ziab sai thiab shrinkage. HPMC pab tswj cov dej noo, yog li txo qis qhov tshwm sim ntawm qhov tawg tawg.
4. Kev ruaj ntseg thiab ruaj khov
HPMC pab txhawb rau qhov sib xws thiab ruaj khov ntawm cov cement-based mixes. Qhov no ua rau cov ntawv thov tsis sib xws thiab txhim kho kev ua haujlwm ntawm cov khoom kawg.
Sag Resistance: Hauv kev siv ntsug xws li plasters thiab pobzeb adhesives, HPMC pab tiv thaiv sagging thiab slumping, kom ntseeg tau tias cov khoom nyob twj ywm nyob rau hauv qhov chaw kom txog thaum nws teeb.
Homogeneity: Nws pab nyob rau hauv qhov sib faib ntawm cov khoom xyaw, tiv thaiv kev sib cais thiab muab kev sib xyaw ua ke uas ua tau zoo.
5. Txhim kho cov cuab yeej cuab tam
Kev siv HPMC hauv cov khoom siv cement txhim kho lawv cov khoom siv kho tshuab, suav nrog lub zog tensile, flexural zog, thiab tag nrho cov kav ntev.
Tensile thiab Flucural lub zog: Cov txheej txheem kev txuag kev ua haujlwm ua rau lub denser microstructure, uas txhim kho lub tensile thiab flexural lub zog ntawm cov khoom.
Durability: Kev kho kom zoo dua qub thiab txo qhov tawg ua rau lub sijhawm ntev ntawm cov khoom siv cement, ua rau lawv tiv taus ntau dua rau ib puag ncig thiab kev ntxhov siab.
6. Txhim kho qhov tshwm sim thiab ua tiav
HPMC txhim kho qhov zoo nkauj zoo nkauj ntawm cov khoom siv cement los ntawm kev ua kom zoo dua thiab ua kom zoo dua qub.
Smooth Surface: Kev txhim kho kev ua haujlwm tau zoo thiab sib xws ua kom muaj kev ua haujlwm zoo dua, ua rau lub ntsej muag zoo nkauj dua.
Kev txo qis: Los ntawm kev tiv thaiv cov teeb meem xws li sagging, cais, thiab tawg, HPMC pab ua kom tiav qhov tsis xws luag.
7. Kev ua tau zoo thiab tus nqi-zoo
Kev siv HPMC hauv cov khoom siv cement tuaj yeem ua rau cov txheej txheem siv tau zoo dua thiab muaj peev xwm txuag tau tus nqi.
Txo Cov Khoom Siv Hluav Taws Xob: Txhim kho kev ua haujlwm thiab sib xws kom txo cov khoom siv pov tseg thaum siv.
Kev Ua Haujlwm Zoo: Cov ntawv thov yooj yim dua thiab ncua sijhawm ua haujlwm tuaj yeem ua rau ua tiav qhov project sai dua thiab txo nqi zog.
8. Compatibility nrog lwm yam additives
HPMC yog sib xws nrog ntau yam ntawm lwm yam additives siv nyob rau hauv cement-based khoom, pab txhawb nws versatility.
Synergistic Effects: Thaum siv ua ke nrog lwm cov tshuaj ntxiv xws li superplasticizers, defoamers, thiab air-entraining agents, HPMC tuaj yeem txhim kho lawv cov txiaj ntsig thiab pab txhawb kev ua haujlwm zoo tshaj plaws.
9. Cov txiaj ntsig ib puag ncig
HPMC, muab tau los ntawm cov cellulose ntuj, yog ib qho khoom noj khoom haus zoo thiab zoo ib puag ncig.
Biodegradability: Ua ib qho cellulose derivative, HPMC yog biodegradable thiab tsis ua rau muaj kev phom sij rau ib puag ncig.
Kev Ua Haujlwm Zoo: Nws lub peev xwm los txhim kho kev ua tau zoo thiab ua haujlwm ntev ntawm cov khoom siv cement tuaj yeem ua rau cov qauv siv tau ntev, txo qhov xav tau kev kho ntau zaus thiab kev siv cov peev txheej.
10. Cov ntawv thov tshwj xeeb
HPMC cov khoom tshwj xeeb ua rau nws tsim nyog rau kev siv tshwj xeeb hauv kev tsim kho kev lag luam.
Self-Leveling Compounds: Nyob rau hauv tus kheej-leveling tebchaw, HPMC ua kom ib tug du ntws thiab txawm nto, tseem ceeb heev rau hauv pem teb tiav daim ntaub ntawv.
Kho mortars: Rau kev kho mortars, HPMC muab qhov tsim nyog adhesion thiab kev ua haujlwm kom ntseeg tau tias kev kho kom zoo uas sib txuam nrog cov qauv uas twb muaj lawm.
Kev suav nrog Hydroxypropyl Methylcellulose (HPMC) hauv cov khoom siv cement muaj ntau cov txiaj ntsig, los ntawm kev txhim kho kev ua haujlwm thiab txhim kho adhesion kom zoo dua curing thiab mechanical zog. Nws lub peev xwm los txhim kho qhov sib xws, ruaj khov, thiab cov tsos ntawm cov khoom no ua rau nws muaj txiaj ntsig zoo ntxiv hauv kev tsim kho kev lag luam. Ntxiv mus, HPMC cov txiaj ntsig ib puag ncig thiab kev sib raug zoo nrog lwm cov tshuaj ntxiv ntxiv txhim kho nws cov txiaj ntsig, ua rau nws yog ib qho tseem ceeb hauv kev tsim cov khoom siv cement-based. Los ntawm kev siv cov khoom ntawm HPMC, cov tuam txhab tsim khoom thiab cov neeg tsim khoom tuaj yeem ua tiav cov txiaj ntsig zoo, ua rau cov qauv ruaj khov, ua haujlwm zoo, thiab ua kom zoo nkauj.
Post lub sij hawm: May-29-2024