Hydroxypropyl methylcellulose (HPMC) yog ib qho khoom siv ntau yam uas feem ntau siv hauv cov ntaub ntawv tsim kho, suav nrog cov khoom siv cement xws li mortar thiab plaster, nrog rau cov nplais nplaum thiab grouts. Txawm hais tias nws tsis ncaj qha "tso" dej hauv cov tsev, nws ua lub luag haujlwm tseem ceeb hauv kev tswj cov dej tuav hauv cov khoom siv no.
Dej Retention Capacity: HPMC yog hydrophilic, txhais tau tias nws muaj kev sib raug zoo rau dej. Thaum ntxiv rau cov ntaub ntawv tsim kho, nws tsim ib zaj duab xis nyias nyob ib ncig ntawm cov cement hais. Zaj duab xis no pab cuab dej nyob rau hauv cov khoom siv, tiv thaiv nws los ntawm evaporating dhau sai thaum lub sij hawm kho. Raws li qhov tshwm sim, cov cement tuaj yeem ua kom dej puv thiab txhim kho nws lub zog, txhim kho kev ua haujlwm tag nrho thiab ua haujlwm ntev ntawm cov khoom siv hauv tsev.
Kev ua haujlwm tau zoo: HPMC txhim kho kev ua haujlwm ntawm cov ntaub ntawv tsim kho los ntawm kev txhim kho lawv qhov sib xws thiab txo qis qis lossis poob qis. Qhov no yog ib qho tseem ceeb tshwj xeeb rau cov ntawv thov xws li mortar thiab plaster, qhov twg cov khoom yuav tsum tau yooj yim kis tau thiab khaws nws cov duab yam tsis muaj ntau deformation. Los ntawm kev tswj cov dej cov ntsiab lus thiab viscosity ntawm qhov sib tov, HPMC xyuas kom meej tias cov khoom tseem yooj yim los tuav thiab siv, ua kom yooj yim thiab ua tiav.
Txo Shrinkage: Ib qho ntawm cov teeb meem hauv cov khoom siv cement yog shrinkage thaum lub sij hawm kho. Cov shrinkage ntau dhau tuaj yeem ua rau cov kab nrib pleb thiab lwm yam tsis xws luag, cuam tshuam cov qauv kev ncaj ncees ntawm lub tsev. HPMC pab txo qis qis los ntawm kev tuav cov dej zoo ib yam thoob plaws hauv cov khoom, cia nws kho tusyees yam tsis muaj qhov ntim ntau dhau. Qhov no ua rau txo shrinkage cracking thiab txhim kho lub sij hawm ntev ntawm lub tsev.
Txhim kho Adhesion: Hauv cov pobzeb nplaum thiab cov nplaum, HPMC txhim kho adhesion los ntawm kev txhim kho lub zog sib txuas ntawm cov vuas thiab cov substrate. Lub xub ntiag ntawm HPMC nyob rau hauv daim ntawv nplaum yuav pab tsim kom muaj kev sib raug zoo los ntawm kev ua kom qhov chaw sib cuag ntawm cov pobzeb thiab cov substrate thiab txo qhov kev pheej hmoo ntawm debonding lossis pobzeb detachment thaum lub sij hawm. Qhov no yog qhov tseem ceeb rau kev ua kom muaj kev ncaj ncees thiab ua haujlwm ntev ntawm cov nplais ntawm cov tsev, tshwj xeeb tshaj yog nyob rau hauv qhov chaw muaj dej noo zoo li chav dej thiab chav ua noj.
Txhim kho Flexibility: HPMC kuj tseem tuaj yeem ua kom yooj yim rau cov khoom siv, ua rau lawv tiv taus ntau dua rau kev tawg thiab deformation hauv kev ntxhov siab. Qhov no yog qhov tshwj xeeb tshaj yog rau cov ntawv thov uas cov khoom siv hauv tsev raug txav los yog kev co, xws li sab nrauv renders lossis sib koom ua ke. Los ntawm kev txhim kho cov khoom siv tau yooj yim thiab tawv, HPMC pab tswj cov txheej txheem kev ncaj ncees ntawm lub tsev thiab ua kom nws lub neej ua haujlwm ntev.
Tswj Lub Sijhawm Teeb Meem: HPMC tuaj yeem siv los tswj lub sijhawm teem sijhawm ntawm cov khoom siv cement, tso cai rau kev hloov kho raws li cov haujlwm tshwj xeeb thiab ib puag ncig. Los ntawm kev hloov kho cov khoom rheological ntawm cov khoom sib tov, HPMC tuaj yeem ua kom ntev lossis ua kom lub sijhawm teem sijhawm raws li xav tau, muab kev hloov pauv hauv cov sijhawm tsim kho thiab ua kom pom kev ua haujlwm zoo ntawm cov khoom raws li qhov sib txawv.
Resistance to Efflorescence: Efflorescence, kev tsiv teb tsaws ntawm cov ntsev soluble rau saum npoo ntawm pob zeb lossis masonry, tuaj yeem ua rau lub tsev zoo nkauj thiab cuam tshuam lawv cov kav ntev. HPMC pab txo qis efflorescence los ntawm kev txo cov permeability ntawm cov ntaub ntawv tsim kho thiab txo qhov txav ntawm dej thiab yaj ntsev los ntawm cov substrate. Qhov no yuav pab kom muaj kev zoo nkauj zoo nkauj ntawm lub tsev thiab ua kom nws lub neej ntev kev pab cuam los ntawm kev tiv thaiv kev tsim ntawm unsightly deposits ntawm qhov chaw.
HPMC plays lub luag haujlwm ntau yam hauv cov ntaub ntawv tsim kho, ua rau muaj dej tuav, ua haujlwm tau zoo, ua haujlwm ntev, adhesion, yoog raws, teeb tsa lub sijhawm tswj, thiab tiv thaiv efflorescence. Nws lub peev xwm los txhim kho kev ua tau zoo thiab kev ua haujlwm ntev ntawm cov khoom siv hauv tsev ua rau nws yog ib qho tseem ceeb ntawm cov khoom siv hauv kev tsim kho niaj hnub no, kom ntseeg tau tias kev tsim kho ntawm cov vaj tsev zoo nkauj thiab kav ntev.
Post lub sij hawm: May-08-2024