Hydroxypropyl methylcellulose (HPMC) yog ib qho cellulose ether uas tau los ntawm cov cellulose ntuj thiab siv dav hauv kev lag luam kev tsim kho vim nws cov khoom tshwj xeeb thiab kev hloov pauv tau yooj yim. Hauv cov ntaub ntawv cementitious, HPMC ua ntau yam haujlwm, suav nrog kev txhim kho kev ua haujlwm, kev khaws dej, kev nplaum, thiab kev ruaj khov.
1. Txhim kho kev ua haujlwm:
Kev ua haujlwm tau zoo yog ib qho tseem ceeb ntawm cov pob zeb ua vaj tse thiab cov av nplaum, uas cuam tshuam rau lawv txoj kev tso, kev sib sau ua ke thiab kev ua tiav. Cov tshuaj ntxiv HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm los ntawm kev txo cov kev xav tau dej thaum tswj hwm qhov sib xws. Lub peev xwm khaws dej siab ntawm HPMC txuas ntxiv kev ua haujlwm kom zoo dua rau kev tso thiab ua tiav ntawm cov pob zeb ua vaj tse thiab cov av nplaum. Tsis tas li ntawd, cov ntaub ntawv hloov kho HPMC qhia txog cov khoom rheological zoo dua, ua rau yooj yim dua rau kev nqus dej thiab nchuav dej hauv cov haujlwm tsim kho.
2. Kev khaws dej:
Kev khaws dej yog qhov tseem ceeb heev rau kev ua kom cov khoom siv cementitious muaj dej txaus, tshwj xeeb tshaj yog nyob rau hauv huab cua kub lossis qhuav uas qhov twg cov dej noo sai sai tuaj yeem tshwm sim. HPMC cov khoom ntxiv ua haujlwm ua cov neeg sawv cev khaws dej zoo, tiv thaiv kev qhuav ua ntej ntawm cov pob zeb thiab cov khoom sib xyaw ua ke. HPMC qeeb qeeb cov dej evaporation los ntawm kev tsim cov zaj duab xis nyias nyob ib puag ncig cov cement, yog li ua kom cov txheej txheem hydration ntev dua thiab txhawb kev txhim kho lub zog zoo tshaj plaws. Qhov no yog qhov tshwj xeeb tshaj yog pab tau rau hauv qhov chaw kub siab lossis qis av noo, qhov twg kev tswj cov av noo txaus tuaj yeem nyuaj.
3. Txhim kho kev nplaum:
Qhov kev sib txuas ntawm cov khoom siv cementitious thiab cov substrate yog qhov tseem ceeb rau kev ua tau zoo thiab lub neej ntev ntawm cov khoom siv hauv tsev xws li cov nplaum pobzeb, plasters thiab plasters. HPMC additives txhim kho kev sib txuas los ntawm kev txhim kho lub zog sib txuas ntawm cov khoom siv nto thiab cov nplaum lossis txheej. Cov khoom tsim zaj duab xis ntawm HPMC tsim ib qho thaiv uas txhim kho kev sib cuag ntawm cov nplaum thiab cov substrate, ua rau muaj kev ua tau zoo dua. Tsis tas li ntawd, HPMC pab txo qhov tshwm sim ntawm cov kab nrib pleb shrinkage, yog li txhim kho qhov ruaj khov ntawm qhov chaw sib txuas.
4. Txhim kho kev ruaj khov:
Kev ruaj khov yog qhov tseem ceeb hauv kev tsim kho, tshwj xeeb tshaj yog nyob rau hauv cov qauv uas raug rau cov xwm txheej ib puag ncig hnyav lossis kev ntxhov siab ntawm cov tshuab. Cov tshuaj ntxiv HPMC pab txhim kho kev ruaj khov ntawm cov ntaub ntawv cementitious los ntawm kev ua kom lawv tsis kam rau cov yam xws li kev khov-thaw, kev tawm tsam tshuaj lom neeg thiab kev puas tsuaj. Los ntawm kev txhim kho kev ua haujlwm thiab txo cov dej permeability, HPMC pab txo qhov nkag ntawm cov tshuaj lom neeg mus rau hauv cov pob zeb thiab mortar, yog li ua rau lawv lub neej ua haujlwm ntev dua. Tsis tas li ntawd, cov ntaub ntawv hloov kho HPMC qhia txog kev ua kom muaj zog thiab compressive, yog li txhim kho kev ua haujlwm ntawm cov qauv thiab kev ruaj khov.
5. Cov txiaj ntsig ntawm kev txhim kho kom ruaj khov:
Ntxiv rau lawv cov txiaj ntsig zoo ntawm kev siv tshuab, HPMC cov khoom ntxiv coj cov txiaj ntsig zoo rau kev ruaj khov hauv kev tsim kho. Ua cov khoom siv biodegradable thiab rov ua dua tshiab los ntawm cellulose, HPMC pab txo qhov cuam tshuam rau ib puag ncig ntawm kev ua haujlwm tsim kho. Los ntawm kev ua kom zoo dua cov khoom ntawm cov khoom siv cementitious, HPMC tuaj yeem siv cov ntsiab lus cement qis dua hauv qhov sib tov, yog li txo cov pa roj carbon dioxide uas cuam tshuam nrog kev tsim cov cement. Tsis tas li ntawd, HPMC reinforced mortars thiab concrete pab txhim kho kev siv hluav taws xob ntawm cov tsev los ntawm kev txhim kho cov khoom rwb thaiv tsev thermal thiab txo qhov xav tau cua sov thiab txias dag.
6. Kev cia siab:
Kev thov rau cov ntaub ntawv thiab kev coj ua hauv kev tsim kho kom ruaj khov txuas ntxiv mus, tsav tsheb kev tsim kho tshiab hauv kev tsim cov khoom siv ntxiv uas zoo rau ib puag ncig xws li HPMC. Yav tom ntej ntawm HPMC hauv kev lag luam kev tsim kho yog ci ntsa iab heev, thiab kev tshawb fawb tam sim no yog tsom mus rau kev txhim kho nws cov kev ua tau zoo thiab nthuav nws cov ntawv thov. Tsis tas li ntawd, kev nce qib hauv cov txheej txheem tsim khoom thiab cov thev naus laus zis tsim qauv yuav ua kom zoo dua qhov kev ua tau zoo thiab kev siv nyiaj ntawm HPMC additives, ua rau lawv siv dav hauv cov haujlwm tsim kho thoob plaws ntiaj teb.
Cov tshuaj ntxiv Hydroxypropyl methylcellulose (HPMC) ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom thiab kev ua tau zoo ntawm cov ntaub ntawv cementitious hauv kev siv hauv kev tsim kho. Txij li kev txhim kho kev tsim kho thiab kev khaws cia dej mus rau kev txhim kho kev nplaum thiab kev ruaj khov, HPMC muaj ntau yam txiaj ntsig uas pab txhim kho qhov zoo, kev ruaj khov thiab lub neej ntev ntawm qhov chaw tsim kho. Raws li kev lag luam kev tsim kho txuas ntxiv muab qhov tseem ceeb rau kev ruaj khov thiab kev tsim kho tshiab, HPMC xav tias yuav txuas ntxiv ua ib qho tseem ceeb hauv kev tsim cov khoom siv ua haujlwm siab, cov khoom siv hauv tsev uas zoo rau ib puag ncig.
Lub sijhawm tshaj tawm: Lub Ob Hlis-27-2024