Hydroxypropyl methylcellulose (HPMC) plays lub luag haujlwm tseem ceeb hauv cov khoom sib xyaw ntub dej. Nws cov haujlwm tseem ceeb suav nrog kev tuav dej, ua kom tuab, lubricity, txhim kho kev ua haujlwm thiab ncua sijhawm qhib.
1. Kev tuav dej
Lub luag haujlwm tseem ceeb tshaj plaws ntawm HPMC hauv cov khib nyiab ntub dej yog khaws cia dej. Nws tuaj yeem txo qis tus nqi evaporation ntawm cov dej hauv cov tshuaj khib nyiab. Nov yog qhov tseem ceeb npaum li cas kev tuav dej yog:
Tiv thaiv kom tsis txhob muaj dej tsis txaus: Thaum lub sij hawm tsim kho, HPMC tuaj yeem txo qhov poob dej hauv cov mortar thiab xyuas kom muaj dej txaus ntawm cov cement, yog li txhim kho lub zog thiab kev sib txuas ntawm cov mortar.
Txhim kho kev kho kom zoo: Cov tshuaj khib nyiab nrog cov dej zoo khaws cia tuaj yeem qhuav sib npaug thaum lub sijhawm kho, txo qhov tsim ntawm cov kab nrib pleb thiab voids, kom ntseeg tau qhov zoo thiab ruaj khov ntawm cov mortar.
Lub sijhawm qhib txuas ntxiv: Los ntawm kev tuav dej, HPMC tuaj yeem txuas ntxiv lub sijhawm qhib ntawm lub mortar, uas yog, cov neeg ua haujlwm tsim kho tuaj yeem ua haujlwm rau lub mortar rau lub sijhawm ntev, yog li txhim kho kev tsim kho yooj yim.
2. Thickening
Raws li cov thickener, HPMC tuaj yeem ua kom qhov sib xws thiab viscosity ntawm cov khoom sib xyaw ntub dej. Nws cov kev cuam tshuam tshwj xeeb suav nrog:
Txhim kho cov thixotropy ntawm mortar: Ua kom cov thixotropy ntawm mortar, ua kom nws thicker thaum nyob ruaj khov thiab muaj kua ntau dua thaum nplawm lossis siv lwm lub zog, ua kom kev tsim kho yooj yim dua.
Txhim kho sag tsis kam: HPMC txhim kho lub mortar's sag resistance, tso cai rau nws mus thov tusyees ntawm ntsug saum npoo thiab ua rau nws tsis tshua muaj swb.
Stabilize mortar Cheebtsam: Lub thickening nyhuv ua rau lub Cheebtsam ntawm lub mortar ntau tusyees faib, txo kev sib cais thiab nag lossis daus, yog li txhim kho cov uniformity thiab workability ntawm lub mortar.
3. Lubricity
HPMC muaj lubricity zoo, uas muaj kev cuam tshuam loj rau kev tsim kho ntawm mortar:
Yooj yim rau kev thov: Lubricity ua rau lub mortar smoother thaum thov, txo cov kev sib txhuam ntawm cov cuab yeej thiab mortar thaum lub sij hawm tsim kho, yog li txo qhov nyuaj ntawm kev tsim kho.
Txo adhesion: Lubrication tuaj yeem txo qhov adhesion ntawm mortar rau cov cuab yeej siv, txo qhov nyuaj ntawm kev tu, thiab txhim kho kev tsim kho.
Txhim kho kev tsim kho: ua kom lub ntsej muag du thiab txhim kho tus neeg teb xov tooj kev ua haujlwm zoo, ua rau daim ntawv thov ntawm cov mortar yooj yim dua.
4. Txhim kho kev tsim kho
HPMC txhim kho kev tsim kho kev ua haujlwm ntawm cov khoom sib xyaw ntub dej:
Txhim kho kev ua haujlwm: HPMC txhim kho kev ua haujlwm ntawm mortar, ua kom yooj yim rau kev npaj thiab siv thaum siv.
Txhim kho fluidity: Ua kom zoo fluidity pab cov mortar kom zoo dua qhov chaw tsis xwm yeem thiab qhov khoob thaum tsim kho.
Txo qhov shrinkage kab noj hniav: Txhim kho kev ua haujlwm pab txo qis qhov shrinkage ntawm mortar thaum kho, yog li txo qhov tsim ntawm tawg thiab shrinkage kab noj hniav.
5. Txuas sijhawm qhib
HPMC tuaj yeem txuas ntxiv lub sijhawm qhib ntawm mortar los ntawm nws cov dej tuav thiab thickening zog. Kev ua haujlwm tshwj xeeb yog raws li hauv qab no:
Lub qhov rais ua haujlwm ntev: Hauv kev tsim kho tiag tiag, ncua sijhawm qhib txhais tau tias cov neeg ua haujlwm tsim kho muaj sijhawm ntev dua los hloov kho thiab hloov kho, txo qhov muaj peev xwm ua haujlwm dua.
Txhim kho kev tsim kho kom zoo: Cov sijhawm qhib txuas ntxiv pab kom muaj sijhawm txaus rau kev txiav thaum lub sijhawm tsim kho, yog li txhim kho tag nrho cov kev tsim kho kom zoo.
6. Lwm cov haujlwm
Ntxiv nrog rau cov haujlwm tseem ceeb saum toj no, HPMC tseem muaj qee qhov haujlwm pabcuam:
Kev tiv thaiv khov-thaw: HPMC tuaj yeem txhim kho qhov khov-thaw tiv thaiv ntawm mortar kom nws tseem tuaj yeem tswj tau qhov kev ua tau zoo hauv qhov kub thiab txias.
Txhim kho adhesion: Rau qee qhov, HPMC tuaj yeem txhim kho qhov adhesion ntawm cov tshuaj khib thiab cov khoom siv hauv paus thiab txhim kho cov adhesion ntawm cov tshuaj khib.
Txhim kho kev ua haujlwm tawg: Los ntawm kev ua kom zoo dua cov khoom ntawm mortar, HPMC tuaj yeem txo cov kab nrib pleb los ntawm kev ziab kom qhuav thiab kub hloov, thiab txhim kho qhov tawg tsis kam ntawm mortar.
Hydroxypropyl methylcellulose (HPMC) plays lub luag haujlwm tseem ceeb hauv cov khoom ntub dej ntub dej. Los ntawm nws cov khoom tshwj xeeb ntawm lub cev thiab tshuaj lom neeg, nws txhim kho cov dej tuav, thickening, lubrication thiab kev tsim cov khoom ntawm cov tshuaj khib nyiab, thiab txuas ntxiv lub sijhawm qhib, yog li txhim kho tag nrho cov kev ua tau zoo thiab kev tsim kho ntawm cov mortar. Cov teebmeem no ua rau HPMC yog qhov tseem ceeb ntxiv rau hauv kev lag luam niaj hnub thiab kev tsim kho.
Post lub sij hawm: Jul-03-2024