Lub hauv paus rau phau ntawv
Cov ntawv sau ua ke yog qhov tseem ceeb rau kev tsim kho, muab cov qauv kev ncaj ncees rau cov tsev, txuas hniav, thiab vaj tse. Txawm li cas los xij, cov ntaub ntawv no puas nquag tau tawg thiab ruaj khov teeb meem vim yog muaj ntau yam ib puag ncig thiab kho tshuab. Kev sib xyaw ua ke ntawm cov kev sib ntxiv rau cov cementiousious li cas yog qhov kev tshawb fawb zoo tshawb fawb los txhim kho lawv cov khoom. HydroxyPropyyl methylcellose (HPMC) tau tawm los ua cov lus tseem ceeb rau kev txhim kho cov ntaub ntawv ua haujlwm ntawm cov khoom noj.
Mechanisms ntawm kev ua
HPMC yog lub cellulose ether polymer paub rau nws cov dej khaws cia, viscosity ua, thiab ua yeeb yaj kiab-ua yeeb yaj kiab. Thaum ntxiv rau cov khoom siv xas ib ce, HPMC cuam tshuam cov txheej txheem hydration, cov qauv pore cov qauv, thiab tag nrho cov qauv matrix, thiab txhua txoj kev:
Dej khaws cia thiab tswj kev tswj hwm dej: HPMC txhim kho dej nyob hauv cov cement sib xyaw, uas yog qhov tseem ceeb rau kev ua kom dej xis ntawm cov xis. Ua kom muaj cov dej haus yog qhov tseem ceeb rau kev tsim cov calcium silicate dej (chl) Los ntawm kev khaws dej, HPMC kom cov kev co roj txuas ntxiv tau ntev dua lub sijhawm ntev dua, ua rau ib lub denser thiab ntau homogeneous microstructure.
Viscosity Transpification: Qhov sib ntxiv ntawm HPMC nce viscosity ntawm cov cement muab tshuaj pleev, uas txhim kho cov haujlwm ua haujlwm thiab kev ruaj khov ntawm kev sib xyaw. Qhov no yog tau txais txiaj ntsig tshwj xeeb hauv kev txo tus cais thiab los ntshav, qhov twg dej thiab cov khoom noj zoo sib cais los ntawm cov sib xyaw tseem ceeb. Ib qho kev sib xyaw ruaj khov ua kom muaj kev faib tawm cov kev faib tawm ntawm Caas hais, ua rau muaj zog thiab ntau dua cov khoom tawg.
Zaj duab xis tsim thiab Cov Qauv Pore Qauv Hloov Kho: HPMC ua ib zaj yeeb yaj kiab yooj ywm, cohesive zaj duab xis hauv cov xis mas matrix. Zaj duab xis no tuaj yeem pheej xaiv lub microcacks thiab txhim kho cov txheej txheem duction ntawm cov khoom. Ib qho ntxiv, HPMC cuam tshuam lub qauv pore los ntawm kev txo cov capillary porosity thiab refining pore loj faib. Denser Pore qauv txo tus neeg ua haujlwm, yog li ua kom zoo rau ib puag ncig xws li khov-thaws kev tawm tsam, thiab carbonation.
Cov txiaj ntsig ntawm HPMC hauv cov khoom siv Maas
Kev koom tes ntawm HPMC ua cov khoom siv Maas-raws li cov txiaj ntsig ntau ntxiv, feem ntau tau nce ib ncig ntawm kev txhim kho durability thiab tawg tsis kam:
Nce durabe: HPMC muaj peev xwm khaws dej thiab tswj dej ncaj qha cuam tshuam nrog cov khoom siv ntev ntev ntawm cov khoom siv khov kho. Los ntawm kev ua kom tiav cov dej ua kom tiav thiab txo porosity, HPMC-kho cov ntaub ntawv txhim kho txhim kho kom ntau cov kev tawm tsam, ASR), thiab chloride ion nkag. Qhov kev siv kav ntev no txhais tau cov nqi lub neej ntev thiab txo tus nqi kho mob rau cov qauv.
Txhim kho cov paj tawg tsis kam: kev tawg hauv cov khoom siv rau cov txiv masas tuaj yeem tshwm sim vim cov yas shrinkage, kom qhuav shrinkage, thermal ntxhov siab, thiab cov neeg kho tshuab thauj khoom. HPMC pab txo cov teeb meem no los ntawm nws cov dej khaws cia thiab ua yeeb yaj kiab zaj duab xis. Los ntawm kev tswj cov ntsiab lus dej noo txaus thaum lub sijhawm kho, hpmc txo txoj kev pheej hmoo ntawm cov yas pov tseg. Nws cov kev cuam tshuam rau kev txo lub pore loj thiab txhim kho matrix ductility kuj txhais tau tias cov ntaub ntawv tuaj yeem nqus tau cov kev ntxhov siab zoo dua qub, txo qis cov kev ntxhov siab ntawm cov kab tawg.
Txhim kho kev ua haujlwm ua haujlwm thiab cov khoom siv: kev hloov kho ntawm kev sib xyaw nrog HPMC pab txhawb cov khoom siv tau zoo dua thiab cov khoom siv. Qhov no yog qhov tshwj xeeb tshaj plaws hauv kev tsim kho cov kev yooj yim uas yooj yim ntawm kev siv thiab kev siv ceev yog qhov tseem ceeb. HPMC lub peev xwm los tiv thaiv kev sib cais thiab los ntshav ua kom nruj heev thiab homogeneous, uas yog qhov tseem ceeb rau kev ua tiav cov kev ua tiav zoo thiab cov qauv txheej txheem.
Cov Ntawv Thov Siv
HPMC yog siv hauv ntau cov khoom siv cement-raws thiab cov ntawv thov, txhua qhov txiaj ntsig los ntawm nws cov khoom:
Mortars thiab plasters: hauv tshuaj khib thiab plaster thiab plasteric formulations, hpmc txhim kho cov haujlwm ua haujlwm, cov nplaum, thiab tawg tawm. Cov khoom no yog qhov tseem ceeb rau kev ua tiav du, ruaj nrees hauv ob daim ntawv thov sab hauv thiab sab nraud.
Kev Ntsuas Tus Kheej Theem: HPMC txhim kho cov khoom ntws thiab kev ruaj ntseg ntawm kev sib xyaw ua kom pom kev zoo, kom muaj kev sib dhos, tawg dawb. Qhov no yog tau txais txiaj ntsig tshwj xeeb rau cov ntawv thov Flooring uas ib qib thiab ua tiav tiav yog qhov yuav tsum tau ua tiav.
Pobzeb Cov Ntawv Qhia: HPMC txhim kho cov nplaum thiab qhib lub sij hawm cov nplaum nplaum, muab lub sijhawm txaus ua haujlwm txaus thiab muaj txiaj ntsig zoo. Qhov no ua rau txhim kho durability thiab kuj ua rau shear kev nyuaj siab, uas tuaj yeem ua rau cov vuas luaj los yog txhob txhob tawm tsam.
Kho Khoom Siv: hauv kev kho cov nyiaj txiag thiab grouts, hpmc pab txhawb kev ua haujlwm zoo dua thiab txo cov shrinkage, ua kom muaj kev kho kom ruaj khov thiab tawg dawb. Qhov no yog qhov tseem ceeb rau kev rov ua kom muaj kev ncaj ncees ntawm cov qauv kev puas tsuaj.
Shartcrete thiab txau Qhob: HPMC txhim kho cov cohesion thiab adhesion ntawm pob txha thiab adhesion ntawm cov kab mob npo teg, txo cov nyiaj rov qab thiab ua kom muaj zog ua ke nrog cov substrate. Qhov no yog qhov tshwj xeeb tshaj yog nyob rau hauv tunneling thiab av tsim khoom qhov twg ruaj khov thiab tawg tsis kam yog qhov tseem ceeb.
Qhov txuam nrog hydroxypropal methylpecellulose (HPMC) hauv cov khoom siv Maas-basic basic tau txhim kho lawv cov kev ua kom ruaj khov thiab tiv thaiv kom tawg. Los ntawm kev txhim kho cov dej cia, kev txhim kho viscosibrosity, thiab kev tsim cov yeeb yaj kiab hloov pauv uas tsis muaj teeb meem ntsig txog kev ntsuas dej, porosity, thiab kev faib tawm kev ntxhov siab. Cov kev txhim kho no ua rau muaj cov khoom siv uas muaj ntau dua, tawg-resistant, thiab yooj yim dua ua haujlwm nrog, uas txhais tau ntev dua-kav ntev. Raws li kev tsim txom kev tsim kho txuas ntxiv mus txhim kho kev ua tau zoo thiab ntev ntawm cov khoom siv xiss, HPMC sawv tawm raws li cov txiaj ntsig ntxiv nrog cov txiaj ntsig dav dav thiab cov ntawv thov.
Lub Sijhawm Post: Feb-18-2025