Gypsum yog ib yam khoom siv hauv tsev uas siv rau kev kho kom zoo nkauj sab hauv thiab sab nraud phab ntsa. Nws nrov vim nws ruaj khov, zoo nkauj, thiab tiv taus hluav taws. Txawm li cas los xij, txawm tias muaj cov txiaj ntsig no, plaster tuaj yeem tsim cov kab nrib pleb dhau sijhawm, uas tuaj yeem ua rau nws tsis zoo thiab cuam tshuam rau nws qhov tsos. Kev tawg ntawm plaster tuaj yeem tshwm sim rau ntau yam laj thawj, suav nrog cov yam ntxwv ib puag ncig, kev tsim kho tsis raug, thiab cov ntaub ntawv tsis zoo. Nyob rau xyoo tas los no, hydroxypropyl methylcellulose (HPMC) additives tau tshwm sim los ua kev daws teeb meem los tiv thaiv kev tawg ntawm plaster. Tsab xov xwm no qhia txog qhov tseem ceeb ntawm HPMC additives hauv kev tiv thaiv kev tawg ntawm plaster thiab lawv ua haujlwm li cas.
Cov tshuaj ntxiv HPMC yog dab tsi thiab lawv ua haujlwm li cas?
Cov tshuaj ntxiv HPMC feem ntau siv rau hauv kev lag luam kev tsim kho ua cov neeg sawv cev txheej thiab cov viscosity modifiers hauv ntau daim ntawv thov, suav nrog plastering. Tau los ntawm cellulose, lawv yaj tau hauv dej txias thiab dej kub thiab yog li ntawd tuaj yeem siv rau ntau yam kev siv hauv kev tsim kho. Thaum sib xyaw nrog dej, HPMC hmoov tsim cov tshuaj zoo li gel uas tuaj yeem ntxiv rau cov khoom sib xyaw stucco lossis siv ua txheej rau saum npoo ntawm phab ntsa plastered. Cov qauv zoo li gel ntawm HPMC tso cai rau nws kis tau sib npaug, tiv thaiv kev ua kom noo noo ntau dhau thiab txo qhov kev pheej hmoo ntawm kev tawg.
Ib qho txiaj ntsig tseem ceeb ntawm HPMC cov khoom ntxiv yog lub peev xwm los tswj qhov nrawm ntawm cov dej ntawm gypsum, ua rau lub sijhawm teeb tsa zoo tagnrho. Cov khoom ntxiv no tsim ib qho thaiv uas ua rau qeeb qeeb ntawm kev tso dej tawm, yog li txo qhov muaj feem ntawm kev qhuav ua ntej thiab tom qab ntawd tawg. Tsis tas li ntawd, HPMC tuaj yeem tawg cov pa hauv cov khoom sib xyaw gypsum, uas pab txhim kho nws txoj haujlwm thiab ua rau nws yooj yim dua rau kev siv.
Tiv thaiv kom tsis txhob muaj cov kab nrib pleb los ntawm kev siv cov tshuaj ntxiv HPMC
Kev ziab kom qhuav
Ib qho ntawm cov ua rau lub plaster tawg yog qhov qhuav ntawm qhov chaw plaster. Qhov no tshwm sim thaum lub stucco qhuav thiab ntsws, tsim kev nruj uas ua rau tawg. HPMC additives tuaj yeem pab txo qhov qhuav ntsws los ntawm kev txo qhov ceev uas dej evaporate los ntawm cov sib tov gypsum, ua rau muaj kev faib dej sib npaug. Thaum cov sib tov plaster muaj cov dej noo sib xws, qhov ceev ziab yog sib xws, txo qhov kev pheej hmoo ntawm kev tawg thiab ntsws.
Kev sib xyaw tsis raug
Feem ntau, cov plaster sib xyaw tsis zoo yuav ua rau muaj cov qhov tsis muaj zog uas yooj yim tawg. Kev siv cov tshuaj ntxiv HPMC hauv cov gypsum sib xyaw tuaj yeem pab txhim kho cov khoom siv hauv kev tsim kho thiab ua rau cov txheej txheem tsim kho du. Cov tshuaj ntxiv no faib cov dej kom sib npaug thoob plaws hauv cov plaster, ua rau muaj zog sib xws thiab txo qhov kev pheej hmoo ntawm kev tawg.
kev hloov pauv ntawm qhov kub thiab txias
Qhov kub thiab txias hloov pauv ntau heev ua rau cov stucco nthuav dav thiab sib zog, ua rau muaj kev ntxhov siab uas ua rau tawg. Kev siv cov tshuaj ntxiv HPMC txo qhov nrawm ntawm cov dej evaporation, yog li ua rau cov txheej txheem kho qeeb thiab txo qhov kev pheej hmoo ntawm kev nthuav dav sai ntawm thermal. Thaum plaster qhuav sib npaug, nws txo qhov muaj peev xwm rau thaj chaw hauv zos kom qhuav dhau, tsim kev ntxhov siab uas ua rau tawg.
Lub sijhawm kho tsis txaus
Tej zaum qhov tseem ceeb tshaj plaws hauv kev tawg plaster yog lub sijhawm kho tsis txaus. Cov khoom ntxiv HPMC ua rau qeeb qeeb ntawm kev tso dej los ntawm cov sib tov gypsum, yog li ntawd ntev lub sijhawm teeb tsa. Lub sijhawm kho ntev dua txhim kho qhov sib xws ntawm cov stucco thiab txo qhov pom ntawm cov chaw tsis muaj zog uas yuav tawg. Tsis tas li ntawd, cov khoom ntxiv HPMC pab tsim ib qho kev thaiv tiv thaiv huab cua hnyav uas tuaj yeem ua rau muaj kev tawg hauv thaj chaw raug.
xaus lus
Kev tawg ntawm stucco yog ib qho uas tshwm sim hauv kev lag luam kev tsim kho thiab tuaj yeem ua rau kev kho kim thiab cov qhov tsis zoo nkauj. Txawm hais tias muaj ntau yam uas tuaj yeem ua rau muaj kev tawg ntawm plaster, kev siv HPMC additives yog ib qho kev daws teeb meem zoo los tiv thaiv kev tawg. Lub luag haujlwm ntawm HPMC additives yog los tsim ib qho thaiv uas tiv thaiv kev ua kom cov dej noo ntau dhau thiab txo qhov qhuav shrinkage thiab thermal expansion. Cov additives no kuj txhim kho kev ua haujlwm, ua rau muaj zog sib xws thiab zoo dua plaster. Los ntawm kev ntxiv HPMC additives rau hauv plaster sib tov, cov neeg tsim kho tuaj yeem ua kom muaj qhov chaw ruaj khov dua, pom kev zoo nkauj.
Lub sijhawm tshaj tawm: Cuaj hlis-26-2023