Hydroxypropyl methylcellulose (HPMC) yog ib qho khoom siv ntxiv uas siv tau ntau yam hauv kev lag luam kev tsim kho, tshwj xeeb tshaj yog hauv cov qauv plaster. Gypsum plaster, tseem hu ua plaster of Paris, yog ib yam khoom siv hauv tsev uas siv los pleev xim rau phab ntsa thiab qab nthab. HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua tau zoo thiab kev ua tau zoo ntawm gypsum plaster.
HPMC yog cov cellulose ether uas tsis yog ionic tau los ntawm cov polymer cellulose ntuj los ntawm ntau yam kev hloov pauv tshuaj. Nws yog tsim los ntawm kev kho cellulose nrog propylene oxide thiab methyl chloride. Cov khoom tshwm sim yog cov hmoov dawb uas yaj tau hauv dej thiab tsim cov kua nplaum pob tshab.
Nov yog qee qhov tseem ceeb ntawm HPMC rau plaster:
1. Kev khaws dej:
Ib qho ntawm cov haujlwm tseem ceeb ntawm HPMC hauv gypsum yog nws lub peev xwm tuav dej. Nws pab tiv thaiv kom tsis txhob poob dej sai sai thaum lub sijhawm ziab, ua rau muaj kev tswj hwm thiab teeb tsa ntawm cov plaster ntau dua. Qhov no yog qhov tseem ceeb kom ua tiav lub zog thiab kev sib xws ntawm cov plaster.
2. Txhim kho kev ua haujlwm tau zoo:
HPMC ua rau gypsum plaster ua haujlwm tau zoo dua los ntawm kev muab lub sijhawm qhib zoo dua thiab ua rau tsis plam. Qhov no ua rau nws yooj yim dua rau kev thov thiab nthuav cov stucco hla qhov chaw, ua rau du thiab sib npaug dua.
3. Kev sib txuas thiab kev sib koom ua ke:
HPMC pab txhawb kev sib txuas ntawm gypsum plaster rau ntau yam substrates. Nws txhim kho qhov kev sib txuas ntawm stucco thiab qhov chaw hauv qab, ua kom muaj kev ua tiav ntev thiab ruaj khov. Tsis tas li ntawd, HPMC txhim kho kev sib txuas ntawm plaster nws tus kheej, yog li ua rau muaj zog thiab txo qhov tawg.
4. Cov nyhuv tuab:
Hauv cov qauv gypsum, HPMC ua haujlwm ua cov khoom ua kom tuab, cuam tshuam rau qhov viscosity ntawm cov sib tov gypsum. Qhov kev ua kom tuab no yog qhov tseem ceeb rau kev ua tiav qhov sib xws thiab cov qauv xav tau thaum lub sijhawm thov. Nws kuj pab tiv thaiv stucco los ntawm sagging lossis collapsing ntawm cov chaw ntsug.
5. Teem sijhawm tswj:
Kev tswj lub sijhawm teeb tsa ntawm gypsum plaster yog qhov tseem ceeb hauv kev siv vaj tse. HPMC tuaj yeem kho lub sijhawm teeb tsa kom muaj kev ywj pheej kom ua tau raws li cov kev xav tau tshwj xeeb. Qhov no tseem ceeb heev rau cov haujlwm loj dua uas yuav xav tau lub sijhawm teeb tsa sib txawv.
6. Cov nyhuv rau qhov porosity:
Qhov muaj HPMC cuam tshuam rau qhov porosity ntawm gypsum. Cov plaster uas tsim tau zoo nrog HPMC tuaj yeem ua rau muaj kev tiv thaiv dej nkag mus thiab txo qhov porosity, yog li ua rau muaj kev ruaj khov thiab tiv thaiv cov yam ntxwv ib puag ncig.
7. Kev sib raug zoo nrog lwm cov khoom ntxiv:
HPMC sib xws nrog ntau yam khoom siv ntxiv uas feem ntau siv rau hauv cov qauv gypsum. Qhov kev hloov pauv no tso cai rau cov khoom sib tov plaster kom raug kho kom ua tau raws li cov qauv kev ua tau zoo thiab cov kev xav tau ntawm daim ntawv thov.
8. Kev xav txog ib puag ncig:
HPMC feem ntau suav tias muaj kev nyab xeeb thiab zoo rau ib puag ncig. Nws tsis muaj tshuaj lom thiab tsis tso cov tshuaj lom thaum lub sijhawm lossis tom qab pleev xim. Qhov no yog sib xws nrog kev nce qib ntawm kev siv cov qauv tsim kho kom ruaj khov thiab zoo rau ib puag ncig.
Hydroxypropyl methylcellulose (HPMC) ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua tau zoo ntawm gypsum hauv kev siv hauv kev tsim kho. Nws cov dej khaws cia, kev txhim kho kev ua haujlwm, kev nplaum, cov nyhuv tuab, kev tswj lub sijhawm teeb tsa, cov nyhuv rau porosity, kev sib raug zoo nrog lwm cov khoom ntxiv thiab kev xav txog ib puag ncig ua rau nws yog ib qho khoom ntxiv muaj txiaj ntsig zoo hauv cov qauv gypsum zoo. Raws li kev coj ua hauv kev tsim kho txuas ntxiv mus, HPMC tseem yog ib qho khoom xyaw tseem ceeb hauv kev txhim kho kev ua haujlwm zoo thiab kev ruaj khov ntawm gypsum plaster hauv ntau yam kev tsim kho thiab kev tsim kho.
Lub sijhawm tshaj tawm: Lub Ib Hlis-22-2024