Cov hmoov putty thiab plaster yog cov khoom siv nrov siv dav hauv kev lag luam kev tsim kho. Lawv yog qhov tseem ceeb rau kev npaj phab ntsa thiab qab nthab rau kev pleev xim, npog cov kab nrib pleb, kho cov chaw puas tsuaj, thiab tsim cov chaw du thiab sib npaug. Lawv muaj cov khoom xyaw sib txawv suav nrog cement, xuab zeb, lime thiab lwm yam khoom ntxiv los muab cov kev ua tau zoo thiab cov yam ntxwv xav tau. Methylhydroxyethylcellulose (MHEC) yog ib qho ntawm cov khoom ntxiv tseem ceeb siv hauv kev tsim cov hmoov putty thiab plaster. Nws yog siv los txhim kho cov khoom ntawm cov hmoov, txhim kho lawv cov khoom ua haujlwm thiab ua kom zoo dua lawv cov ntawv thov.
Cov txiaj ntsig ntawm kev siv MHEC los tsim cov hmoov putty thiab gypsum
MHEC yog muab los ntawm cellulose thiab tsim los ntawm cov txheej txheem hloov kho tshuaj. Nws yog ib qho tshuaj uas yaj tau hauv dej uas siv dav dav ua cov khoom ua kom tuab, ruaj khov thiab emulsifier hauv kev lag luam kev tsim kho. Thaum ntxiv rau hauv cov hmoov putty thiab gypsum, MHEC txheej cov khoom me me, muab ib txheej tiv thaiv uas tiv thaiv lawv kom tsis txhob sib sau ua ke thiab poob. Qhov no tsim cov khoom sib xyaw ua ke zoo dua, sib xws dua uas yooj yim ua haujlwm nrog thiab muab qhov tiav zoo dua.
Ib qho ntawm cov txiaj ntsig tseem ceeb ntawm kev siv MHEC hauv cov putties thiab plasters yog tias nws ua rau lawv cov yam ntxwv khaws dej zoo dua. MHEC nqus thiab khaws cov dej noo, ua kom ntseeg tau tias cov khoom sib tov tseem siv tau thiab tsis qhuav sai dhau. Qhov no tseem ceeb heev rau hauv qhov chaw kub thiab qhuav uas cov khoom sib tov sai sai siv tsis tau, ua rau cov khoom tiav tsis zoo.
MHEC kuj tseem ua kom yooj yim dua rau kev ua haujlwm thiab lub sijhawm ua haujlwm ntawm cov putties thiab plasters. MHEC ua rau kev sib tov thiab kev siv cov khoom sib tov yooj yim dua los ntawm kev khaws cov dej noo thiab tiv thaiv kom cov khoom sib tov tsis qhuav. Tsis tas li ntawd, MHEC cov qauv du thiab zoo li buttery tso cai rau putty thiab stucco kom nthuav dav thoob plaws qhov chaw yam tsis muaj pob lossis clumps, ua kom ntseeg tau tias muaj qhov tiav zoo nkauj thiab zoo nkauj.
Ntxiv rau qhov ua kom cov putties thiab plasters zoo nkauj dua thiab ua haujlwm tau zoo dua, MHEC kuj tseem tuaj yeem txhim kho lawv cov khoom sib txuas. Los ntawm kev tsim ib txheej tiv thaiv nyob ib puag ncig cov khoom me me, MHEC ua kom lawv sib txuas zoo dua rau qhov chaw uas lawv kho. Qhov no ua rau muaj qhov chaw muaj zog dua, ruaj khov dua uas yuav tsis tawg, tawg lossis tev tawm raws sijhawm.
Lwm qhov txiaj ntsig tseem ceeb ntawm kev siv MHEC hauv putty thiab plaster yog tias nws ua rau lawv tiv taus huab cua thiab dej noo ntau ntxiv. Qhov no txhais tau tias thaum putty lossis stucco raug siv, nws yuav tiv taus kev puas tsuaj los ntawm huab cua thiab dej noo, ua kom qhov chaw tseem ruaj khov thiab zoo nkauj mus ntev.
Siv MHEC los txhim kho kev ua haujlwm ntawm Putty thiab Gypsum
Yuav kom ua tau zoo tshaj plaws ntawm cov hmoov putty thiab plaster, nws yog ib qho tseem ceeb kom ntseeg tau tias MHEC siv rau hauv qhov sib piv kom raug. Qhov no txhais tau tias kev siv cov MHEC kom raug tuaj yeem ua tiav qhov kev ua tau zoo thiab cov yam ntxwv ntawm cov putty lossis stucco uas tsim tawm.
Yuav tsum xav txog tej yam ib puag ncig uas yuav cuam tshuam rau kev ua haujlwm ntawm putty thiab hmoov gypsum. Piv txwv li, nyob rau hauv qhov chaw kub thiab qhuav, yuav tsum ntxiv ntau MHEC kom ntseeg tau tias qhov sib tov tseem muaj sia nyob thiab sib xws.
Nws yog ib qho tseem ceeb heev uas yuav tsum xyuas kom meej tias cov putty lossis stucco raug siv kom raug kom ua tau zoo tshaj plaws. Qhov no txhais tau tias ua raws li cov lus qhia ntawm cov chaw tsim khoom kom zoo thiab xyuas kom meej tias cov khoom sib xyaw ua ke zoo ua ntej siv. Tsis tas li ntawd, tej zaum yuav xav tau cov cuab yeej tshwj xeeb los xyuas kom meej tias cov putty lossis stucco raug siv sib npaug thiab sib xws rau ntawm qhov chaw kho.
MHEC yog ib qho tshuaj ntxiv tseem ceeb uas siv rau hauv kev tsim cov hmoov putty thiab plaster. Nws ua kom cov khoom thiab cov yam ntxwv ntawm cov ntaub ntawv no zoo dua, txhim kho lawv txoj kev ua haujlwm, kev khaws dej, kev nplaum thiab kev tiv taus huab cua thiab dej noo. Qhov no ua rau muaj qhov tiav zoo dua, ruaj khov thiab zoo nkauj uas tsis tshua muaj kev tawg, tawg lossis tev tawm dhau sijhawm. Yuav kom ua tau zoo tshaj plaws ntawm cov hmoov putty thiab gypsum, nws yog ib qho tseem ceeb kom ntseeg tau tias siv cov tshuaj MHEC kom raug, xav txog cov yam ntxwv ib puag ncig uas yuav cuam tshuam rau lawv cov kev ua tau zoo. Tsis tas li ntawd, nws yog ib qho tseem ceeb kom siv cov putty lossis stucco kom raug kom ua tau zoo tshaj plaws thiab ua tiav cov txiaj ntsig xav tau.
HEMC siv rau hauv cov qauv cement los txhim kho nws cov khoom Hydroxyethyl methylcellulose (HEMC) yog ib yam tshuaj siv dav hauv kev lag luam kev tsim kho. Nws yog qhov txuas ntawm kev ua haujlwm tau zoo, kev khaws dej, thixotropy, thiab lwm yam. Niaj hnub no, ib hom cellulose ether tshiab tau txais kev saib xyuas ntau dua. Qhov uas tau nyiam ntau dua yog hydroxyethyl methylcellulose (MHEC).
Ib qho tseem ceeb tshaj plaws uas txiav txim siab qhov zoo ntawm cov khoom cement yog qhov ua tau zoo ntawm cov khoom sib tov. Yog li ntawd cement yooj yim rau kev sib tov, ua kom zoo nkauj thiab tso. Yuav kom ua tiav qhov no, cov khoom sib tov cement yuav tsum muaj kua txaus kom nchuav thiab ntws tau yooj yim, tab sis nws kuj yuav tsum muaj viscous txaus kom tuav nws cov duab. MHEC tuaj yeem ua tiav qhov khoom no los ntawm kev ua kom cov cement viscosity nce ntxiv, yog li txhim kho nws qhov ua tau zoo.
MHEC kuj tseem tuaj yeem ua kom cov cement noo sai dua thiab txhim kho nws lub zog. Lub zog kawg ntawm cov cement nyob ntawm seb muaj pes tsawg dej siv los sib tov nws. Dej ntau dhau yuav txo qhov zog ntawm cov cement, thaum dej tsawg dhau yuav ua rau nws nyuaj rau ua haujlwm nrog. MHEC pab khaws qee qhov dej, yog li ua kom cov cement noo zoo tshaj plaws thiab txhawb kev tsim cov kev sib txuas zoo ntawm cov khoom cement.
MHEC pab txo cov kab nrib pleb ntawm cov cement. Thaum cov cement khov, cov khoom sib xyaw yuav ntsws, uas tuaj yeem ua rau muaj kab nrib pleb yog tias tsis tswj kom ntsws. MHEC tiv thaiv qhov ntsws no los ntawm kev tswj kom muaj dej txaus hauv cov khoom sib xyaw, yog li tiv thaiv cov cement kom tsis txhob tawg.
MHEC kuj ua haujlwm ua ib daim zaj duab xis tiv thaiv rau ntawm qhov chaw cement, tiv thaiv kom dej tsis txhob evaporate ntawm qhov chaw. Daim zaj duab xis no kuj pab tswj cov dej noo qub ntawm cov cement, txo qhov muaj feem yuav tawg.
MHEC kuj zoo rau ib puag ncig. Ua ntej, nws yog biodegradable, uas txhais tau tias nws tsis nyob hauv ib puag ncig ntev. Qhov thib ob, nws tuaj yeem pab txo qhov ntau ntawm cov cement uas xav tau hauv cov haujlwm tsim kho. Qhov no yog vim MHEC ua rau kom ua haujlwm tau zoo thiab viscosity ntawm cov cement, txo qhov xav tau dej ntxiv uas tsuas yog ua rau cov cement sib tov.
Kev siv MHEC hauv cov cement muaj ntau yam zoo thiab tuaj yeem pab txhawb rau kev lag luam kev tsim kho. Nws ua rau kom cov cement sib xyaw ua haujlwm tau zoo dua, txo cov kab nrib pleb uas tshwm sim thaum lub sijhawm kho, txhawb kom cov cement noo thiab muaj zog, thiab ua haujlwm ua ib daim zaj duab xis tiv thaiv ntawm qhov chaw cement. Tsis tas li ntawd, MHEC zoo rau ib puag ncig. Yog li ntawd, MHEC yog ib yam khoom muaj nqis rau kev lag luam kev tsim kho vim nws txhim kho qhov zoo ntawm cov cement thiab muab cov txiaj ntsig rau cov neeg ua haujlwm thiab ib puag ncig.
Lub sijhawm tshaj tawm: Lub Kaum Hli-18-2023