Hydroxypropyl methylcellulose (HPMC) yog ib qho cellulose ether uas siv dav hauv cov ntaub ntawv siv hauv kev tsim kho, tshwj xeeb tshaj yog hauv cov av ntub. Lub luag haujlwm tseem ceeb ntawm HPMC yog los txhim kho qhov ua haujlwm tau zoo thiab kev ua tau zoo kawg ntawm cov av ntub los ntawm kev kho qhov viscosity, kev khaws dej thiab kev ua tau zoo ntawm cov av.
1. Kev khaws dej
Ib qho ntawm lub luag haujlwm tseem ceeb tshaj plaws ntawm HPMC hauv cov mortar ntub yog los txhim kho qhov khaws cia dej ntawm cov mortar. Thaum lub sijhawm tsim kho, cov dej noo ntawm cov mortar yooj yim nqus los ntawm cov khoom siv hauv paus lossis ib puag ncig, ua rau muaj dej poob ntau dhau, uas cuam tshuam rau qhov tawv thiab kho ntawm cov mortar. HPMC muaj kev nqus dej zoo thiab khaws cia dej, thiab tuaj yeem tsim cov zaj duab xis nyias hauv cov mortar, txo cov dej poob, thiab xyuas kom meej tias cov mortar tswj tau qhov ntub kom zoo rau lub sijhawm ntev.
Los ntawm kev ua kom cov dej khaws cia ntawm cov mortar, HPMC pab txhim kho cov dej ntawm cov cement, yog li ua kom lub zog sib txuas thiab lub zog ntawm cov mortar. Tshwj xeeb tshaj yog nyob rau hauv qhov chaw qhuav lossis ntawm cov substrates nrog lub zog nqus dej, cov dej khaws cia ntawm HPMC yog qhov tseem ceeb heev, uas tuaj yeem zam cov teeb meem xws li tawg thiab qhov khoob los ntawm kev poob dej sai hauv cov mortar.
2. Cov nyhuv tuab
HPMC muaj cov nyhuv ua kom tuab thiab tuaj yeem ua rau cov mortar ntub viscosity ntau ntxiv. Cov nyhuv ua kom tuab no ua rau cov mortar muaj kev ruaj khov zoo thiab ua haujlwm tau zoo thaum lub sijhawm tsim kho, zam kev teeb meem xws li sagging thiab slipping los ntawm cov mortar fluidity ntau dhau thaum lub sijhawm tsim kho.
Qhov ua kom tuab kuj tseem ua rau cov mortar lo rau ntawm cov substrate zoo dua, yog li ua kom zoo dua qub. Tsis tas li ntawd, qhov khoom ua kom tuab ntawm HPMC kuj tseem tuaj yeem pab faib lwm yam khoom hauv cov mortar, xws li cement, xuab zeb thiab cov khoom ntxiv, kom lawv sib npaug zos, txhim kho kev sib xyaw thiab kev sib xws ntawm cov mortar.
3. Kev ua tau zoo dua ntawm kev tsim kho
Kev siv HPMC hauv cov av nplaum ntub dej ua rau nws txoj kev ua haujlwm zoo dua qub. Kev ua haujlwm zoo ntawm cov av nplaum ntub dej feem ntau pom tseeb hauv nws qhov yooj yim ntawm kev ua haujlwm thiab kev ua kom zoo nkauj. Kev ntxiv HPMC ua rau cov av nplaum tsim cov colloid nrog qee qhov sib xws tom qab sib tov, uas yooj yim dua thaum lub sijhawm tsim kho thiab yooj yim rau kev thov thiab theem.
Tib lub sijhawm, HPMC kuj tseem tuaj yeem txo qhov kev sib txhuam ntawm cov mortar thiab cov cuab yeej siv hauv kev tsim kho, txhim kho qhov kev nthuav dav thiab kev ua haujlwm ntawm cov mortar, thiab ua rau cov txheej txheem tsim kho du dua. Tshwj xeeb tshaj yog hauv kev pleev phab ntsa thiab kev sib txuas pobzeb, HPMC tuaj yeem ua rau cov mortar lo rau lub hauv paus zoo dua thaum lub sijhawm tsim kho, txo qhov rov qab thiab poob.
4. Txhim kho cov khoom tiv thaiv kev sagging
Thaum lub sijhawm tsim kho, cov mortar ntub feem ntau yuav tsum tau siv rau ntawm qhov chaw ntsug lossis qhov chaw nkhaus. Yog tias cov mortar nyias dhau, nws yooj yim rau sag, cuam tshuam rau qhov cuam tshuam ntawm kev tsim kho thiab qhov chaw tiaj tus. HPMC txhim kho cov khoom tiv thaiv kev sag ntawm mortar los ntawm nws cov nyhuv thickening thiab cov khoom nplaum, yog li cov mortar tuaj yeem tswj nws cov duab zoo dua thiab txo qhov sagging thaum lub sijhawm tsim kho.
Cov khoom no tiv thaiv kev sagging no yog qhov tsim nyog rau cov xwm txheej xws li cov tshuaj nplaum rwb thaiv tsev phab ntsa sab nraud thiab cov nplaum pobzeb uas yuav tsum tau ua haujlwm ntsug lossis ntawm qhov siab. Nws tuaj yeem tiv thaiv cov tshuaj nplaum kom tsis txhob swb, yog li txhim kho kev tsim kho kom zoo thiab qhov zoo ntawm qhov chaw.
5. Ntev lub sijhawm qhib
HPMC tuaj yeem ncua lub sijhawm qhib ntawm cov mortar ntub, uas yog, lub sijhawm uas cov mortar tseem tuaj yeem tsim tau hauv lub xeev tsis tau tawv. Tom qab kev tsim kho, mortar yuav maj mam poob dej thiab tawv. Yog tias lub sijhawm qhib luv dhau, cov neeg ua haujlwm tsim kho yuav tsis tuaj yeem ua tiav txoj haujlwm raws sijhawm, ua rau kev tsim kho zoo poob qis. Qhov cuam tshuam ntawm kev khaws dej ntawm HPMC ncua sijhawm ua kom cov dej evaporation, ua rau cov mortar tswj tau qhov ua haujlwm nruab nrab rau lub sijhawm ntev dua, ua rau nws yooj yim dua rau cov neeg ua haujlwm tsim kho los kho thiab hloov kho cov ntsiab lus tsim kho.
Qhov tshwj xeeb ntawm kev ncua sijhawm qhib no yog qhov tseem ceeb rau kev tsim kho loj, uas tuaj yeem txo qhov zaus ntawm kev sib tov cov mortar thiab txhim kho kev ua haujlwm zoo thiab zoo.
6. Txhim kho qhov tawg tsis kam
Qhov kev khaws dej ntawm HPMC tsis yog tsuas yog pab kom lub sijhawm tawv ntawm cov mortar ntev dua xwb, tab sis kuj tseem tiv thaiv kom tsis txhob muaj kab nrib pleb hauv cov mortar vim muaj dej poob ntau dhau thaum lub sijhawm ziab. HPMC ua kom cov dej noo ntawm cov mortar tau faib sib npaug thaum lub sijhawm kho, txo qhov kev ntxhov siab los ntawm kev ntsws, thiab yog li txhim kho qhov kev tiv thaiv kab nrib pleb ntawm cov mortar.
Qhov kev tiv thaiv kab nrib pleb no yog qhov tseem ceeb rau cov xwm txheej kev tsim kho xws li kev pleev phab ntsa thiab cov tshuaj mortar hauv pem teb uas nws tus kheej leveled, uas pab ua kom lub tsev siv tau ntev dua thiab txhim kho qhov zoo ntawm tag nrho cov haujlwm.
7. Txhim kho lub zog ntawm kev sib txuas
Kev siv HPMC tuaj yeem txhim kho lub zog sib txuas ntawm cov mortar ntub. Lub zog sib txuas yog qhov sib txuas ntawm mortar thiab cov khoom siv substrate, uas cuam tshuam ncaj qha rau qhov zoo thiab cov nyhuv ntawm kev tsim kho. Los ntawm kev ua kom cov viscosity thiab dej khaws cia ntawm mortar, HPMC pab txhim kho thaj chaw sib cuag thiab kev sib txuas ntawm mortar thiab substrate, tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov xws li cov nplaum pobzeb thiab plastering phab ntsa sab nraud.
8. Kev cuam tshuam rau kev faib cov npuas dej
Lwm lub luag haujlwm ntawm HPMC hauv cov mortar ntub yog cuam tshuam rau kev tsim thiab kev faib tawm ntawm cov npuas. Los ntawm kev tswj cov npuas kom zoo, HPMC tuaj yeem ua rau kom cov mortar fluidity thiab workability, thaum txo cov voids hauv mortar thiab zam kev poob zog lossis qhov tsis zoo ntawm qhov chaw los ntawm kev faib tawm tsis sib xws ntawm cov npuas.
Hydroxypropyl methylcellulose (HPMC) ua lub luag haujlwm tseem ceeb hauv cov mortar ntub hauv ntau yam. Nws txhim kho kev ua tau zoo ntawm cov mortar ntub los ntawm kev ua kom cov dej khaws cia, viscosity, tiv thaiv kev sagging, thiab kev ua haujlwm ntawm mortar, thiab ua kom zoo thiab ua haujlwm tau zoo ntawm kev tsim kho. Hauv cov ntaub ntawv tsim kho niaj hnub, HPMC tau dhau los ua cov khoom ntxiv tseem ceeb thiab siv dav hauv ntau lub tshuab mortar los txhim kho qhov zoo thiab ruaj khov ntawm kev tsim kho tsev.
Lub sijhawm tshaj tawm: Cuaj hlis-20-2024