Xaiv qhov tsim nyog viscosity ntawm Hydroxypropyl Methylcellulose (HPMC) rau kev tsim cov hmoov qhuav mortar yog qhov tseem ceeb rau kev ua kom pom kev ua haujlwm zoo thiab cov yam ntxwv ntawm cov khoom kawg. Qhov kev xaiv no cuam tshuam rau ntau yam khoom, suav nrog kev tuav dej, kev ua haujlwm, adhesion, thiab lub sijhawm qhib. Nov yog cov lus qhia ntxaws ntxaws los pab koj nkag siab thiab xaiv HPMC viscosity txoj cai rau koj cov hmoov qhuav mortar ntau lawm.
Nkag siab txog HPMC
Hydroxypropyl Methylcellulose (HPMC) yog non-ionic cellulose ether ua los ntawm ntuj polymer cellulose los ntawm ntau cov txheej txheem tshuaj. Nws ua hauj lwm raws li ib tug thickener, binder, zaj duab xis-yav dhau los, thiab dej tuav tus neeg sawv cev nyob rau hauv qhuav mortar formulations.
Lub luag haujlwm tseem ceeb ntawm HPMC hauv mortar qhuav
Kev tuav dej: Ua kom muaj dej txaus ntawm cov cement thiab txiv qaub, txhim kho kev ua haujlwm thiab txo qhov tawg.
Thickening: Txhim kho viscosity, pab txhawb kev ua haujlwm zoo dua thiab ruaj khov ntawm cov tshuaj khib.
Adhesion: Txhim kho lub zog sib txuas ntawm cov mortar rau substrates.
Ua haujlwm tau zoo: cuam tshuam qhov yooj yim ntawm daim ntawv thov thiab smoothness ntawm qhov tiav.
Lub Sijhawm Qhib: Txuas ntxiv lub sijhawm uas lub mortar tseem ua haujlwm tau tom qab sib xyaw nrog dej.
Tej yam yuav tsum tau xav txog thaum xaiv HPMC Viscosity
Daim ntawv thov yuav tsum tau:
Phab ntsa Putty: Yuav tsum muaj qhov sib npaug ntawm kev ua haujlwm thiab kev tuav dej. Feem ntau, nruab nrab viscosity HPMC (50,000 txog 100,000 mPa.s) yog qhov tsim nyog.
Pobzeb Adhesives: Cov viscosity siab dua (100,000 txog 200,000 mPa.s) yog xav tau rau kev ua kom zoo dua thiab ua haujlwm tsis zoo.
Skim Coat: Tsawg mus rau nruab nrab viscosity (20,000 mus rau 60,000 mPa.s) rau daim ntawv thov du thiab tiav.
Ib puag ncig tej yam kev mob:
Kub thiab av noo: Cov viscosity siab dua HPMC tuaj yeem muab cov dej khaws cia zoo dua hauv qhov kub thiab qhuav, ua kom muaj kev ua haujlwm ntev dua thiab txo qis kom qhuav ntxov ntxov.
Cov yam ntxwv ntawm Base Material:
Porosity thiab Absorption Rate: Rau cov substrates uas absorbent heev, siab dua viscosity HPMC pab khaws cov dej noo ntev dua, tiv thaiv kom qhuav sai thiab ua kom zoo dua adhesion.
Desired Performance Properties:
Ua haujlwm tau zoo: Cov viscosity siab dua HPMC muab cov tuab tuab, uas tuaj yeem txhim kho qhov yooj yim ntawm kev sib kis thiab txo qis sagging.
Lub Sijhawm Qhib: Lub sijhawm qhib ntev dua yog qhov tsim nyog rau cov ntawv thov loj lossis huab cua kub, ua tiav nrog cov viscosity siab dua HPMC.
Sag Resistance: Cov viscosity siab dua muab kev tiv thaiv zoo dua, tseem ceeb heev rau kev siv ntsug.
Cov kauj ruam hauv kev xaiv HPMC Viscosity
Ntsuam xyuas hom kev thov:
Txiav txim siab seb cov khoom puas yog rau phab ntsa putty, pobzeb nplaum, lossis skim tsho.
Nkag siab txog cov kev xav tau tshwj xeeb xws li tuav dej, adhesion, thiab lub sijhawm qhib.
Lab Kev Xeem:
Ua cov kev sim me me nrog HPMC viscosities sib txawv los soj ntsuam kev ua haujlwm.
Ntsuas cov ntsuas tsis xws li dej tuav, ua haujlwm, thiab lub zog adhesion.
Kho raws li qhov tshwm sim:
Fine-tune qhov kev xaiv viscosity raws li cov txiaj ntsig kev xeem.
Xyuas kom cov khoom kawg ua tau raws li txhua daim ntawv thov thiab kev ua haujlwm.
Common Viscosity ranges rau ntau daim ntawv thov
Phab ntsa Putty: 50,000-100,000 mPa
Pobzeb Adhesive: 100,000 rau 200,000 mPa.
Skim Coats: 20,000 - 60,000 mPa.s
Kev cuam tshuam ntawm viscosity ntawm kev ua haujlwm
Tsawg viscosity HPMC (<50,000 mPa.s): Muab kev ua haujlwm zoo thiab ua haujlwm zoo. Tsawg zog hauv dej tuav thiab sag kuj. Haum rau cov tsho zoo nkauj thiab cov tsho skim. Medium Viscosity HPMC (50,000 - 100,000 mPa.s): Sib npaug dej tuav thiab ua haujlwm. Haum rau kev siv phab ntsa putty. Txhim kho adhesion thiab qhib lub sijhawm nruab nrab. High Viscosity HPMC (> 100,000 mPa.s):
Cov dej zoo khaws cia thiab adhesion zog.
Zoo dua sag kuj thiab qhib lub sijhawm.
Zoo tagnrho rau cov pobzeb nplaum thiab cov txheej txheem ua haujlwm siab.
Xaiv qhov tseeb HPMC viscosity rau putty hmoov qhuav mortar ntau lawm yog ib tug multifaceted kev txiav txim siab uas cuam tshuam cov khoom tag nrho cov kev ua tau zoo thiab usability. Los ntawm kev txiav txim siab txog daim ntawv thov, ib puag ncig, cov yam ntxwv ntawm cov khoom siv, thiab cov khoom xav tau, cov tuam txhab tuaj yeem xaiv HPMC qib tsim nyog. Ua kom tiav kev sim thiab kev hloov kho kom ntseeg tau tias cov viscosity xaiv tau raws li cov kev xav tau tshwj xeeb ntawm daim ntawv thov, ua rau cov khoom zoo, txhim khu kev qha.
Post lub sij hawm: May-23-2024