Hydroxypropyl methylcellulose (HPMC) yog ib qho khoom siv ntau yam siv dav hauv kev tsim kho kev lag luam, tshwj xeeb tshaj yog nyob rau hauv plaster formulations. Gypsum plaster, tseem hu ua plaster ntawm Paris, yog cov khoom siv hauv tsev nrov siv los pleev cov phab ntsa thiab qab nthab. HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm thiab kev ua haujlwm ntawm gypsum plaster.
HPMC yog non-ionic cellulose ether tau los ntawm ntuj polymer cellulose los ntawm kev hloov tshuaj lom neeg. Nws yog tsim los ntawm kev kho cellulose nrog propylene oxide thiab methyl chloride. Cov khoom uas tshwm sim yog cov hmoov dawb uas yog soluble hauv dej thiab tsim cov kua nplaum pob tshab.
Nov yog qee qhov tseem ceeb ntawm HPMC rau plaster:
1. Kev tuav 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 ya raws sai thaum lub sijhawm ziab, tso cai rau kev tswj hwm ntau dua thiab txawm tias qhov chaw ntawm plaster. Qhov no yog qhov tseem ceeb kom ua tiav qhov xav tau lub zog thiab sib xws ntawm plaster.
2. Txhim kho kev ua tau zoo:
HPMC txhim kho kev ua haujlwm ntawm gypsum plaster los ntawm kev muab lub sijhawm qhib zoo dua thiab ua kom muaj zog ntxiv. Qhov no ua rau nws yooj yim dua rau kev thov thiab nthuav tawm cov stucco tshaj qhov chaw, ua rau kom smoother, ntau dua tiav.
3. Adhesion thiab cohesion:
HPMC pab nyob rau hauv adhesion ntawm gypsum plaster rau ntau yam substrates. Nws txhim kho qhov adhesion ntawm stucco thiab hauv qab ntawm qhov chaw, kom ntseeg tau qhov ntev thiab ruaj khov. Tsis tas li ntawd, HPMC txhim kho kev sib koom ua ke ntawm plaster nws tus kheej, yog li ua kom muaj zog thiab txo qhov tawg.
4. Thickening nyhuv:
Nyob rau hauv gypsum formulations, HPMC ua raws li ib tug thickener, cuam tshuam lub viscosity ntawm gypsum sib tov. Cov nyhuv thickening no yog qhov tseem ceeb rau kev ua tiav qhov xav tau sib xws thiab kev ntxhib los mos thaum siv. Nws kuj pab tiv thaiv stucco los ntawm sagging los yog collapsing ntawm ntsug nto.
5. Teem sijhawm tswj:
Kev tswj lub sijhawm teeb tsa ntawm gypsum plaster yog qhov tseem ceeb hauv kev siv vaj tsev. HPMC tuaj yeem kho lub sijhawm teem sijhawm los muab qhov yooj yim kom ua tau raws li qhov xav tau tshwj xeeb. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog rau cov haujlwm loj uas yuav xav tau lub sijhawm sib txawv.
6. Qhov cuam tshuam rau porosity:
Lub xub ntiag ntawm HPMC cuam tshuam rau qhov porosity ntawm gypsum. Kev tsim cov plaster zoo nrog HPMC tuaj yeem ua rau muaj kev tiv thaiv dej nkag thiab txo qhov porosity, yog li ua kom muaj zog thiab ua haujlwm rau ib puag ncig yam.
7. Compatibility nrog lwm yam additives:
HPMC yog sib xws nrog ntau yam ntawm lwm yam additives feem ntau siv nyob rau hauv gypsum formulations. Qhov kev ua tau zoo no tso cai rau cov plaster sib xyaw kom haum raws li cov qauv kev ua tau zoo thiab cov ntawv thov.
8. Kev xav txog ib puag ncig:
HPMC feem ntau suav hais tias muaj kev nyab xeeb thiab ib puag ncig tus phooj ywg. Nws yog non-toxic thiab tsis tso tawm cov teeb meem thaum lub sij hawm los yog tom qab plastering. Qhov no yog ua raws li qhov tseem ceeb ntawm kev tsim kho kom ruaj khov thiab muaj txiaj ntsig zoo hauv eco.
Hydroxypropyl methylcellulose (HPMC) plays lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm gypsum hauv kev tsim kho. Nws cov dej tuav, txhim kho kev ua haujlwm, adhesion, thickening nyhuv, teem sij hawm tswj, cuam tshuam rau porosity, compatibility nrog rau lwm yam additives thiab ib puag ncig xav txog ua rau nws ib tug tseem ceeb additive nyob rau hauv high-zoo gypsum formulations. Raws li kev tsim kho txuas ntxiv mus, HPMC tseem yog cov khoom tseem ceeb hauv kev txhim kho kev ua haujlwm thiab ua haujlwm ntev ntawm gypsum plaster nyob rau hauv ntau yam ntawm lub tsev thiab kev tsim kho.
Post lub sij hawm: Jan-22-2024