Hydroxypropyl methylcellulose (HPMC) yog ib hom cellulose ether, uas yog siv dav hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv ntub mortar. Lub luag haujlwm tseem ceeb ntawm HPMC yog txhawm rau txhim kho kev ua haujlwm thiab kev ua haujlwm kawg ntawm cov khib nyiab ntub dej los ntawm kev kho cov viscosity, dej tuav thiab kev tsim kho ntawm mortar.
1. Kev tuav dej
Ib lub luag haujlwm tseem ceeb tshaj plaws ntawm HPMC hauv mortar ntub yog txhawm rau txhim kho cov dej khaws cia ntawm mortar. Thaum lub sij hawm tsim kho, cov dej noo ntawm mortar tau yooj yim absorbed los ntawm cov khoom siv hauv paus lossis ib puag ncig, ua rau cov dej ntau dhau, uas cuam tshuam rau hardening thiab curing ntawm mortar. HPMC muaj cov dej nqus dej zoo thiab khaws cia dej, thiab tuaj yeem tsim cov yeeb yaj kiab nyias hauv mortar, txo cov dej poob, thiab xyuas kom meej tias cov tshuaj khib nyiab khaws cov ntub dej kom zoo rau lub sijhawm ntev.
Los ntawm kev ua kom cov dej tuav ntawm mortar, HPMC pab txhim kho cov dej ntawm cov cement, yog li txhim kho cov kev sib raug zoo ntawm cov mortar thiab durability. Tshwj xeeb tshaj yog nyob rau hauv ib puag ncig qhuav los yog nyob rau hauv substrates uas muaj zog nqus dej, cov dej tuav cov nyhuv ntawm HPMC yog ib qho tseem ceeb tshwj xeeb, uas tuaj yeem zam cov teeb meem xws li tawg thiab hollows los ntawm kev poob dej sai hauv mortar.
2. Thickening nyhuv
HPMC muaj cov nyhuv thickening thiab tuaj yeem ua kom cov viscosity ntawm cov mortar ntub. Cov nyhuv thickening no ua rau cov mortar muaj kev ruaj ntseg zoo thiab ua haujlwm tau zoo thaum lub sij hawm tsim kho, tsis txhob muaj teeb meem xws li sagging thiab slipping los ntawm cov dej ntau dhau ntawm cov mortar thaum tsim kho.
Cov nyhuv thickening kuj tuaj yeem ua rau cov mortar adhere zoo dua rau cov substrate, yog li txhim kho kev tsim kho kom zoo. Tsis tas li ntawd, cov cuab yeej thickening ntawm HPMC tseem tuaj yeem pab cuam tshuam lwm cov khoom hauv cov tshuaj khib nyiab, xws li cov cement, xuab zeb thiab cov khoom ntxiv, kom lawv sib npaug sib npaug, txhim kho qhov sib xyaw thiab sib npaug ntawm cov tshuaj khib.
3. Txhim kho kev tsim kho kev ua haujlwm
Daim ntawv thov ntawm HPMC hauv cov khib nyiab ntub dej zoo heev txhim kho nws txoj kev tsim kho. Kev tsim kho kev ua haujlwm ntawm cov mortar ntub dej feem ntau yog tshwm sim hauv nws txoj haujlwm yooj yim thiab plasticity. Qhov sib ntxiv ntawm HPMC ua rau mortar tsim ib qho colloid nrog ib qho kev sib xws tom qab sib tov, uas yooj yim dua thaum siv thiab yooj yim rau kev thov thiab qib.
Nyob rau tib lub sijhawm, HPMC tuaj yeem txo qhov kev sib txhuam ntawm cov tshuaj khib thiab cov cuab yeej siv, txhim kho kev sib kis thiab kev ua kom zoo ntawm cov mortar, thiab ua kom cov txheej txheem tsim kho kom zoo dua. Tshwj xeeb tshaj yog nyob rau hauv phab ntsa plastering thiab pobzeb sib txuas, HPMC tuaj yeem ua kom cov mortar adhere zoo dua rau lub hauv paus thaum lub sij hawm tsim kho, txo qhov rov qab thiab poob.
4. Txhim kho cov khoom tiv thaiv sagging
Thaum lub sij hawm tsim kho, ntub mortar feem ntau yuav tsum tau siv rau ntawm ntsug los yog inclined nto. Yog hais tias lub mortar nyias dhau lawm, nws yooj yim rau sag, cuam tshuam rau kev tsim kho thiab nto flatness. HPMC zoo heev txhim kho cov cuab yeej tiv thaiv sagging ntawm mortar los ntawm nws cov nyhuv thickening thiab adhesion zog, yog li ntawd lub mortar tuaj yeem tswj tau nws cov duab zoo dua thiab txo qis thaum siv.
Cov cuab yeej tiv thaiv sagging no tshwj xeeb tshaj yog tsim rau scenes xws li sab nrauv phab ntsa rwb thaiv tsev mortar thiab cov nplais nplaum uas yuav tsum tau ua haujlwm vertically lossis ntawm qhov siab. Nws tuaj yeem tiv thaiv cov mortar los ntawm zawv zawg, yog li txhim kho kev tsim kho thiab ua kom zoo.
5. Txuas lub sijhawm qhib
HPMC tuaj yeem txuas ntxiv lub sijhawm qhib ntawm mortar ntub, uas yog, lub sijhawm uas lub mortar tseem tuaj yeem tsim hauv lub xeev tsis muaj zog. 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 cov haujlwm raws sijhawm, uas ua rau kev tsim kho tsis zoo. Cov dej tuav cov nyhuv ntawm HPMC ncua lub evaporation ntawm cov dej, tso cai rau lub mortar kom muaj kev ua haujlwm nruab nrab rau lub sijhawm ntev, ua rau nws yooj yim dua rau cov neeg ua haujlwm tsim kho thiab hloov cov ntsiab lus ntawm kev tsim kho.
Qhov no feature ntawm ncua sij hawm qhib yog ib qho tseem ceeb tshwj xeeb tshaj yog rau kev tsim loj loj, uas tuaj yeem txo qhov zaus ntawm kev sib xyaw ntawm cov mortar thiab txhim kho kev tsim kho kom zoo thiab zoo.
6. Txhim khu kev tiv thaiv tawg
Kev tuav dej ntawm HPMC tsis yog tsuas yog pab txuas ntxiv lub sijhawm hardening ntawm mortar, tab sis kuj tseem tiv thaiv cov kab nrib pleb los ntawm kev tsim hauv mortar vim dej ntau dhau thaum lub sijhawm ziab. HPMC xyuas kom meej tias cov dej noo ntawm cov mortar yog sib npaug ntawm cov txheej txheem kho, txo cov kev ntxhov siab vim los ntawm shrinkage, thiab yog li txhim kho qhov tawg tsis kam ntawm mortar.
Qhov kev tiv thaiv tawg no yog qhov tseem ceeb rau kev tsim kho qhov xwm txheej xws li phab ntsa plastering thiab nws tus kheej-leveling pem teb mortar, uas pab kom ntev lub neej kev pab cuam ntawm lub tsev thiab txhim kho tag nrho qhov project zoo.
7. Txhim kho daim ntawv cog lus
Kev siv HPMC tuaj yeem txhim kho lub zog ntawm daim ntawv cog lus ntub dej. Bond zog yog qhov adhesion ntawm mortar thiab substrate khoom, uas ncaj qha cuam tshuam rau qhov zoo thiab cov nyhuv ntawm kev tsim kho. Los ntawm kev ua kom cov viscosity thiab dej tuav ntawm mortar, HPMC pab txhim kho qhov chaw sib cuag thiab adhesion ntawm mortar thiab substrate, tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov xws li pobzeb adhesives thiab sab nrauv phab ntsa plastering.
8. Kev cuam tshuam ntawm kev faib ua npuas
Lwm lub luag haujlwm ntawm HPMC hauv cov khib nyiab ntub yog cuam tshuam rau tiam thiab kev faib cov npuas. Los ntawm txoj cai ua npuas dej kom raug, HPMC tuaj yeem ua kom lub cev muaj zog thiab ua haujlwm ntawm cov mortar, thaum txo cov voids hauv mortar thiab tsis txhob muaj lub zog poob lossis qhov tsis xws luag los ntawm qhov tsis sib xws ntawm cov npuas.
Hydroxypropyl methylcellulose (HPMC) plays lub luag haujlwm tseem ceeb hauv mortar ntub dej hauv ntau yam. Nws txhim kho cov kev ua tau zoo ntawm cov khib nyiab ntub dej los ntawm kev ua kom cov dej tuav, viscosity, tiv thaiv sagging, thiab kev ua haujlwm ntawm mortar, thiab ua kom zoo thiab ua haujlwm ntawm kev tsim kho. Hauv cov khoom siv hauv tsev niaj hnub no, HPMC tau dhau los ua ib qho khoom siv tsis tseem ceeb thiab tau siv dav hauv ntau lub tshuab mortar los txhim kho qhov zoo thiab ruaj khov ntawm kev tsim vaj tsev.
Post lub sij hawm: Sep-20-2024