Hydroxypropyl methylcellulose (HPMC)yog ib qho polymer cellulose ether uas yaj tau hauv dej. Vim nws cov khoom zoo heev uas ua rau tuab, khaws dej, tsim zaj duab xis, ua kom lubrication, thiab ua haujlwm tau zoo, nws yog siv dav hauv cov mortars qhuav rau kev tsim kho. Hauv cov qauv nplaum pobzeb, HPMC yog ib qho tseem ceeb tshaj plaws, txhim kho cov khoom siv lub cev thiab kev ua haujlwm ntawm cov nplaum pobzeb, yog li ua kom ntseeg tau tias cov pobzeb nplaum ruaj khov thiab ruaj khov.
1. Kev Khaws Dej
Thaum lub sijhawm siv cov txheej txheem, cov nplaum rau pobzeb ua haujlwm ua ke nrog cov cement, xuab zeb quartz, thiab lwm yam khoom ntxiv. Dej yog ib qho tseem ceeb rau kev ua kom cov cement noo thiab cov khoom tawv. Txawm li cas los xij, hauv kev siv tiag tiag, cov substrates feem ntau muaj kev nqus dej zoo. Kev poob dej ntau dhau tuaj yeem ua rau lub zog sib txuas txo qis lossis txawm tias tsis ua haujlwm.
HPMC yaj hauv dej los ua ib qho kua nplaum ruaj khov thiab nplaum uas tsim ib daim zaj duab xis uas tuav dej sib xws hauv cov nplaum, txo qhov poob dej thaum sib tov. Nws cov dej khaws cia zoo heev ua kom ntseeg tau tias:
Ua kom lub sijhawm ua kom cov cement hydration ntev dua, txhawb kev ua kom cov cement tag nrho, thiab txhim kho lub zog nplaum;
Tiv thaiv kom tsis txhob hollowing thiab flaking, txhim kho lub sijhawm ntev ntawm cov vuas;
Txhim kho kev hloov pauv ntawm daim ntawv thov, ua kom cov vuas nplaum txawm tias nyob rau qhov kub siab lossis ntawm cov khoom siv uas nqus tau dej zoo.
2. Ua kom tuab thiab txhim kho cov khoom rheological
Cov nplaum rau pobzeb xav tau cov dej ntws thiab cov khoom thixotropic kom yooj yim rau kev siv thiab tswj kev ruaj khov tom qab kev teeb tsa pobzeb, tiv thaiv kev khiav tawm lossis sagging. Kev ntxiv HPMC tuaj yeem kho qhov viscosity thiab rheological ntawm cov nplaum pobzeb:
Kev ua kom lub cev viscosity nce ntxiv ua kom daim ntawv thov du thiab lo rau lub substrate thaum lub sijhawm thov;
Kev txhim kho thixotropy ua rau cov nplaum pobzeb ntws zoo dua thaum raug cov zog sab nraud (xws li kev siv scraper), pab txhawb kev nthuav dav; thiab rov qab mus rau qhov viscosity siab dua tom qab sawv, ua kom cov pobzeb ruaj khov thiab tiv thaiv kev plam.
Kev txhim kho qhov tuab ntawm daim ntawv thov: Los ntawm kev kho qhov ntau npaum li cas ntawm HPMC thiab qib viscosity, cov kev cai rau kev teeb tsa vuas ntawm ntau yam tuab tuaj yeem ua tau raws li.
3. Txuas Lub Sijhawm Qhib
Lub sijhawm qhib yog lub sijhawm ntev npaum li cas cov nplaum pobzeb tseem lo tau zoo tom qab siv. Thaum lub sijhawm teeb tsa tiag tiag, cov neeg ua haujlwm xav tau sijhawm los teeb tsa thiab kho cov pobzeb. Yog tias lub sijhawm qhib luv dhau, qhov chaw ntawm cov pobzeb poob nws lub zog nplaum, ua rau kev sib txuas tsis zoo.
HPMC, nrog nws cov yam ntxwv uas khaws dej thiab ua zaj duab xis, tuaj yeem ua rau lub sijhawm qhib ntawm cov nplaum pobzeb ntev dua, ua rau kev teeb tsa yooj yim dua thiab txo qhov rov ua dua. HPMC muaj txiaj ntsig zoo hauv kev tswj lub sijhawm qhib hauv qhov kub siab, qis av noo, lossis cua hlob.
4. Txhim kho kev nplaum thiab cov khoom tiv thaiv kev plam
Ib qho ntawm cov yam ntxwv tseem ceeb ntawm cov nplaum pobzeb yog lub zog sib txuas. HPMC txhim kho qhov sib txuas ntawm pobzeb thiab cov khoom siv los ntawm:
Tsim ib zaj duab xis sib xws: Tsim ib zaj duab xis polymer yooj ywm ntawm qhov sib txuas ntawm cov vuas thiab cov khoom siv txhim kho kev sib txuas ntawm cov ntaub ntawv;
Txhawb kom cov cement hydration sib npaug: Txhim kho qhov ceev ntawm cov cement paste, yog li ua kom muaj zog ntawm kev sib txuas;
Txhim kho cov yam ntxwv tiv thaiv kev plam: Tshwj xeeb tshaj yog thaum txhim kho cov vuas loj lossis hnyav, HPMC zoo tiv thaiv cov vuas plam, ua kom ntseeg tau tias kev teeb tsa du.
5. Kev Ua Haujlwm Zoo Dua thiab Kev Ua Haujlwm Tau Zoo Dua
Kev siv cov nplaum rau pobzeb yuav tsum tau du, txuag zog, thiab yooj yim tswj. HPMC txhim kho kev ua haujlwm ntawm cov nplaum rau pobzeb:
Kev nplua zoo dua: Kev siv yooj yim dua, txo cov neeg ua haujlwm txoj haujlwm;
Txhim kho qhov sib npaug ntawm cov slurry: Tsis txhob sib sau ua ke thiab los ntshav, ua rau cov nplais nplaum du dua;
Kev sib raug zoo heev: Kev sib raug zoo tshaj plaws nrog ntau yam inorganic binders thiab polymer hmoov, tswj kev ruaj khov ntawm cov mis.
6. Kev Hloov Kho Tau Rau Ntau Yam Kev Mob Ib puag ncig
Ib puag ncig kev tsim kho yog qhov nyuaj, tej zaum yuav raug kub thiab txias siab, qhuav, thiab av noo. HPMC qhov kev hloov pauv ib puag ncig zoo dua yog pom tseeb hauv:
Tswj kev khaws dej hauv qhov chaw kub siab, tiv thaiv kev qhuav sai ntawm cov nplaum pobzeb;
Muab kev ua haujlwm nruab nrab hauv qhov kub qis, ua kom qeeb thiab ua kom tiav cov dej ntawm cov cement;
Txo qhov cuam tshuam ntawm kev nqus dej rau ntawm cov khoom siv uas nqus tau dej ntau (xws li cov pob zeb aerated).
7. Kev Ua Haujlwm Zoo thiab Tus Nqi Tag Nrho
Txawm hais tias HPMC siv me me ua cov khoom siv polymer ntxiv (feem ntau tsuas yog 0.1% txog 0.5% ntawm qhov hnyav ntawm hmoov hauv cov nplaum pobzeb), nws muaj cov txiaj ntsig zoo:
Txo cov nqi kho dua tshiab: Txo cov vuas pobzeb tev tawm thiab cov nqi hollowing;
Kev txhim kho kev tsim kho kom zoo dua: Ua haujlwm ntev dua thiab txhim kho kom du dua;
Kev ruaj khov dua: Txhim kho lub zog sib txuas tag nrho thiab kev tiv thaiv tawg, ua kom ntseeg tau tias cov vuas vov tsev siv tau ntev dua.
HPMCua lub luag haujlwm tseem ceeb hauv cov nplaum pobzeb: khaws cov dej thiab ua kom tuab, ntev lub sijhawm qhib, txhim kho kev nplaum, txhim kho cov khoom tiv thaiv kev plam, txhim kho kev ua haujlwm, thiab hloov kho rau cov xwm txheej nyuaj ntawm kev tsim kho. Los ntawm kev txhim kho cov khoom siv lub cev thiab tshuaj lom neeg ntawm cov nplaum pobzeb, nws muab kev txhawb nqa txhim khu kev qha rau cov haujlwm tsim kho. Nws tuaj yeem hais tias yog tsis muaj HPMC, kev ua haujlwm ntawm cov nplaum pobzeb niaj hnub yuav raug cuam tshuam loj heev.
Lub sijhawm tshaj tawm: Cuaj hlis-01-2025