Gypsum yog cov khoom siv hauv tsev uas siv rau sab hauv thiab sab nrauv kho kom zoo nkauj phab ntsa. Nws yog nrov rau nws durability, zoo nkauj, thiab hluav taws kub. Txawm li cas los xij, txawm tias cov txiaj ntsig no, plaster tuaj yeem tsim cov kab nrib pleb dhau sijhawm, uas tuaj yeem cuam tshuam nws txoj kev ncaj ncees thiab cuam tshuam rau nws cov tsos. Plaster tawg tuaj yeem tshwm sim rau ntau yam laj thawj, suav nrog ib puag ncig, kev tsim kho tsis raug, thiab cov khoom siv tsis zoo. Nyob rau hauv xyoo tas los no, hydroxypropyl methylcellulose (HPMC) additives tau tshwm sim los ua cov tshuaj tiv thaiv plaster tawg. Kab lus no qhia txog qhov tseem ceeb ntawm HPMC additives hauv kev tiv thaiv plaster tawg thiab lawv ua haujlwm li cas.
HPMC additives yog dab tsi thiab lawv ua haujlwm li cas?
HPMC additives feem ntau yog siv nyob rau hauv kev tsim kho kev lag luam raws li coating agents thiab viscosity modifiers nyob rau hauv ntau daim ntawv thov, nrog rau plastering. Muab tau los ntawm cellulose, lawv yog soluble nyob rau hauv dej txias thiab kub thiab yog li ntawd yuav siv tau nyob rau hauv ntau yam kev siv. Thaum sib xyaw nrog dej, HPMC hmoov tsim cov khoom zoo li gel uas tuaj yeem muab ntxiv rau cov khoom sib xyaw ua ke los yog siv los ua cov txheej txheem rau ntawm phab ntsa plastered. Cov gel zoo li kev ntxhib los mos ntawm HPMC tso cai rau nws sib kis tusyees, tiv thaiv cov evaporation ntau dhau ntawm cov dej noo thiab txo qhov kev pheej hmoo ntawm kev tawg.
Ib qho txiaj ntsig tseem ceeb ntawm HPMC additives yog lub peev xwm los tswj cov dej ntawm cov gypsum, tso cai rau lub sijhawm teem sijhawm zoo. Cov additives no tsim ib qho barrier uas ua rau qeeb tso dej, yog li txo txoj kev ua kom qhuav ntxov ntxov thiab tom qab tawg. Tsis tas li ntawd, HPMC tuaj yeem faib cov pa npuas hauv cov gypsum sib tov, uas pab txhim kho nws txoj haujlwm thiab ua kom yooj yim rau kev thov.
Tiv thaiv plaster tawg los ntawm kev siv HPMC additives
Qhuav shrinkage
Ib qho ntawm cov laj thawj tseem ceeb ntawm plaster cracking yog kom qhuav shrinkage ntawm plaster nto. Qhov no tshwm sim thaum lub stucco dries thiab shrinks, tsim nro uas ua rau tawg. HPMC additives tuaj yeem pab txo kom qhuav shrinkage los ntawm kev txo tus nqi ntawm cov dej evaporates los ntawm cov gypsum sib tov, uas ua rau muaj ntau txawm dej faib. Thaum cov plaster sib tov muaj cov ntsiab lus noo noo zoo ib yam, qhov ziab kom qhuav yog ib yam, txo qhov kev pheej hmoo ntawm kev tawg thiab shrinkage.
Kev sib xyaw tsis raug
Feem ntau, tsis zoo sib xyaw plaster yuav ua rau cov ntsiab lus tsis muaj zog uas tuaj yeem tawg tau yooj yim. Siv HPMC additives hauv gypsum sib tov tuaj yeem pab txhim kho kev tsim kho thiab ua kom cov txheej txheem tsim kho kom zoo dua. Cov additives no disperse dej tusyees thoob plaws hauv lub plaster, tso cai rau lub zog zoo ib yam thiab txo qhov kev pheej hmoo ntawm tawg.
kub hloov pauv
Qhov kub hnyiab heev tuaj yeem ua rau lub stucco nthuav dav thiab cog lus, tsim kom muaj kev nro uas tuaj yeem ua rau tawg. Kev siv HPMC additives txo tus nqi ntawm cov dej evaporation, yog li qeeb cov txheej txheem kho thiab txo qhov kev pheej hmoo ntawm thermal expansion sai. Thaum plaster dries tusyees, nws txo cov peev xwm rau cov cheeb tsam hauv cheeb tsam kom overdry, tsim nro uas tuaj yeem ua rau tawg.
Lub sijhawm kho tsis txaus
Tej zaum qhov tseem ceeb tshaj plaws hauv plaster tawg yog lub sijhawm kho tsis txaus. HPMC additives qeeb tso dej los ntawm gypsum sib tov, yog li ncua lub sij hawm teem. Lub sijhawm kho ntev dua txhim kho qhov sib xws ntawm stucco thiab txo qhov pom ntawm qhov tsis muaj zog uas yuav tawg. Tsis tas li ntawd, HPMC additives pab tsim ib qho kev thaiv tiv thaiv huab cua huab cua uas tuaj yeem ua rau tawg hauv qhov chaw raug.
nyob rau hauv xaus
Kev tawg hauv stucco yog ib txwm muaj nyob rau hauv kev tsim kho kev lag luam thiab tuaj yeem ua rau kev kho kim thiab qhov tsis zoo. Thaum muaj ntau yam uas tuaj yeem ua rau tawg hauv plaster, siv HPMC additives yog ib qho kev daws teeb meem zoo los tiv thaiv cov kab nrib pleb. Lub luag haujlwm ntawm HPMC additives yog los tsim ib qho kev thaiv uas tiv thaiv cov evaporation ntau dhau ntawm cov dej noo thiab txo qis kom qhuav shrinkage thiab thermal expansion. Cov additives no kuj txhim kho kev ua haujlwm, ua rau muaj zog zoo ib yam thiab zoo dua plaster zoo. Los ntawm kev ntxiv HPMC additives rau plaster sib tov, cov neeg tsim khoom tuaj yeem ua kom muaj kev ruaj khov dua, pom qhov muag pom.
Post lub sij hawm: Sep-26-2023