Hydroxypropyl methylcellulose (HPMC) yog ib qho polymer ntau yam uas siv dav hauv ntau yam lag luam suav nrog kev tsim kho. Hauv kev siv gypsum, HPMC ua haujlwm ua ib qho khoom siv ntxiv uas muaj ntau yam txiaj ntsig uas pab txhim kho kev ua tau zoo thiab zoo ntawm cov gypsum formulations.
Kev Taw Qhia rau hydroxypropyl methylcellulose:
Hydroxypropyl methylcellulose yog ib qho polymer semi-synthetic uas tau los ntawm cellulose, ib qho polymer ntuj uas pom muaj nyob rau hauv cov nroj tsuag. HPMC yog synthesized los ntawm kev kho cellulose nrog propylene oxide thiab methyl chloride, ua rau muaj cov tshuaj uas muaj cov khoom zoo dua piv rau cov niam txiv cellulose. Qib ntawm kev hloov pauv (DS) ntawm hydroxypropyl thiab methoxy pawg ntawm cellulose backbone txiav txim siab cov khoom tshwj xeeb ntawm HPMC.
Cov yam ntxwv ntawm HPMC:
Kev khaws dej:
HPMC muaj cov khoom zoo heev uas khaws dej tau zoo thiab tuaj yeem tsim ib daim nyias nyias rau ntawm qhov chaw ntawm gypsum kom qeeb qeeb dej evaporation. Qhov no yog qhov tseem ceeb kom ua tiav cov xwm txheej kho kom zoo tshaj plaws thiab tiv thaiv kom tsis txhob qhuav ua ntej ntawm stucco.
Kev siv tshuab tau zoo dua:
Qhov ntxiv ntawm HPMC ua rau cov plaster ua haujlwm tau zoo dua, ua rau nws yooj yim dua rau kev sib tov, thov thiab nthuav. Kev sib xws zoo dua pab muab kev nplaum zoo dua thiab kev npog ntawm ntau qhov chaw.
Lub sijhawm teeb tsa tswj tau:
HPMC tso cai rau kev tswj hwm ntau dua rau lub sijhawm teeb tsa ntawm cov plaster. Los ntawm kev kho cov ntsiab lus HPMC, cov chaw tsim khoom tuaj yeem hloov kho lub sijhawm teeb tsa kom ua tau raws li cov kev xav tau tshwj xeeb ntawm cov haujlwm, kom ntseeg tau tias kev siv thiab ua tiav zoo tshaj plaws.
Ua kom lub sijhawm qhib ntev dua:
Lub sijhawm qhib yog lub sijhawm uas cov plaster tseem ua haujlwm tau ua ntej nws teeb. HPMC tau ncua nws cov sijhawm qhib kom muab cov kws ua tes ua taw thiab cov neeg ua haujlwm nrog lub sijhawm so kom txaus rau kev thov thiab ua tiav cov haujlwm.
Txhim kho kev nplaum:
Cov yam ntxwv ntawm HPMC ua zaj duab xis pab txhim kho kev sib txuas ntawm cov plaster thiab cov substrate. Qhov no yog qhov tseem ceeb tshwj xeeb los xyuas kom meej tias cov plastered nto muaj lub neej ntev thiab ruaj khov.
Kev tiv thaiv tawg:
HPMC pab txo qhov yuav muaj kab nrib pleb hauv cov plaster los ntawm kev ua kom nws yooj ywm thiab muaj zog. Qhov no yog qhov tseem ceeb rau kev tswj hwm qhov ruaj khov ntawm cov qauv ntawm cov plastered nto mus rau lub sijhawm ntev.
Kev txhim kho rheology:
Rheology hais txog kev ntws thiab kev hloov pauv ntawm cov ntaub ntawv. HPMC tuaj yeem hloov kho cov khoom rheological ntawm gypsum, muab nws qhov sib xws xav tau rau kev siv yooj yim dua thiab kev sib npaug.
Daim ntawv thov ntawm HPMC hauv gypsum:
Cov ntaub ntawv ntawm gypsum:
Hauv cov qauv gypsum, HPMC feem ntau siv los txhim kho kev khaws dej, kev ua haujlwm tau zoo thiab kev nplaum. Nws kuj pab tswj lub sijhawm teeb tsa thiab txhim kho kev ua tau zoo ntawm gypsum-based stucco.
Kev siv cov cement ua plastering:
HPMC siv dav hauv cov cement-based plasters qhov twg nws yog ib qho tseem ceeb additive kom ua tiav qhov rheology, qhib lub sijhawm thiab adhesion xav tau. Tswj lub sijhawm teeb tsa yog qhov tshwj xeeb tshaj yog rau cov haujlwm loj.
Txiv qaub nplaum:
Cov qauv plaster lime tau txais txiaj ntsig los ntawm kev ntxiv HPMC los txhim kho kev khaws dej thiab kev ua haujlwm tau zoo. Cov polymer sib xws nrog cov ntaub ntawv ua los ntawm lime ua rau nws yog qhov kev xaiv tsim nyog rau cov haujlwm keeb kwm thiab kev kho dua tshiab.
Cov Txheej Txheem Rwb Thaiv Sab Nraud thiab Cov Txheej Txheem Ua tiav (EIFS):
HPMC yog ib feem tseem ceeb ntawm EIFS daim ntawv thov, pab txhim kho kev nplaum, kev ywj pheej thiab kev tiv thaiv tawg. Nws cov khoom khaws dej tau zoo tshwj xeeb hauv cov kab ke stucco sab nraud.
xaus lus:
Hydroxypropyl methylcellulose yog ib qho khoom siv zoo meej hauv cov qauv gypsum vim nws muaj ntau yam kev pab txhawb rau kev khaws cia dej, kev ua haujlwm tau zoo, kev tswj lub sijhawm teeb tsa, kev nplaum thiab kev tiv thaiv tawg. Txawm siv rau hauv cov plaster, cement, lime lossis cov txheej txheem rwb thaiv tsev phab ntsa sab nraud, HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua tau zoo thiab zoo ntawm plaster. Raws li kev coj ua hauv kev tsim kho txuas ntxiv mus, HPMC qhov kev hloov pauv thiab kev ntseeg tau tau ua rau nws yog ib qho tseem ceeb ntawm cov qauv plaster niaj hnub, ua kom muaj lub neej ntev thiab ua tiav hauv ntau yam haujlwm tsim kho.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-28-2023