HPMC (HydroxyPropyyl methylcellulose) yog ib txwm siv polymer hauv cov ntaub ntawv hauv tsev, tshwj xeeb tshaj yog hauv cov khoom noj. Nws yog ib qho tsis-ionic cellulose uas nws tus yam ntxwv tseem ceeb yog cov dej solubility zoo, thickening, dej ceev thiab ua yeeb yam-ua yeeb yam khoom.
1. Dej khaws cov nyhuv
Ib qho tseem ceeb ntawm HPMC hauv cov cement yog dej khaws cia. Cov dej hauv cugas cug lossis pob zeb ua kom zoo sai rau hauv theem pib, tshwj xeeb tshaj yog nyob rau hauv cov chaw tsim khoom kub thiab kub. Kev khiav dej tsis txaus yuav ua rau cov tshuaj tiv thaiv tsis txaus ntawm cov xis mas, yog li cuam tshuam rau kev tsim lub zog. HPMC muaj peev xwm txhim kho cov dej ceev ceev ntawm cug thiab qhob. Los ntawm kev sib sau zaj duab xis tiv thaiv nyob rau saum npoo ntawm Maas hais, ua kom muaj kev haus dej ntawm cov xis mas, thiab txhim kho lub zog kawg.
2. Txhim kho cov khoom lag luam
HPMC muaj cov khoom siv thicking zoo heev thiab tuaj yeem nce viscosity ntawm xis mas cort lossis pob zeb ua kom yooj yim, ua kom yooj yim rau kev siv thiab txua. Nws ua rau cov tshuaj khib yooj yim rau kev lag luam thiab tsawg dua qub rau sagging lossis delamination, yog li txhim kho kev tsim kho kev tsim kho kev tsim kho. Rau kev tsim kho loj-thaj chaw lossis kab ntsug sab nrauv, HPMC tuaj yeem ua kom muaj cov khoom siv tshuaj khib thiab zam cov khoom siv pov tseg thiab siv cov teeb meem zoo los ntawm kev muaj teeb meem ntau dhau.
3. Txhim kho kev tawg
Cov khoom siv xissib raws li cov txheej txheem tawv, thiab shrinkage kev ntxhov siab yuav ua rau tawg. HPMC qeeb qeeb ntawm qhov ziab khaub ncaws ntawm txoj kev hloov pauv ntawm cov xis mas slurry los ntawm dej kev ntxhov siab, yog li txo qhov kev ntxhov siab sab hauv los ntawm kev ziab shrinkage. Tsis tas li ntawd, HPMC txhim kho cov nplaum thiab tso cov khoom siv kom zoo dua tawg thaum nws ntxhov siab thiab txo qhov tshwm sim ntawm cov kab nrib pleb. Qhov no yog qhov tshwj xeeb tshaj yog rau kev tsim kho cov dej num xws li plastering cug thiab screed cov ntaub ntawv uas xav tau cov khoom zoo.
4. Txhim kho Frost Kuj
Nyob rau hauv ib puag ncig txias, lub friafl tsis kam ntawm caas-based cov ntaub ntawv yog qhov taw qhia tseem ceeb. Qhov kev sib txuas ntawm HPMC tuaj yeem txhim kho lub khov-thaw puag ncig tiv thaiv cug. Cov dej ua kom ruaj khov thiab ua yeeb yaj kiab ua yeeb yam ntawm HPMC ua rau cov dej khov ntawm cov khoom siv hauv qab.
5. Txhim Kho Lub Zog
Daim ntawv thov ntawm HPMC hauv kev cement tseem tuaj yeem txhim kho txoj kev sib txuas lub zog ntawm cov khoom siv xis mas raws li cov ntaub ntawv. Nws txhim kho cov rheology ntawm cov cement slurry, cia cov slurry kom nkag mus rau hauv cov khoom siv hluav taws xob thiab cov khoom siv hauv paus, yog li txhim kho lub zog ua kom muaj zog. Qhov no yog qhov tshwj xeeb yog qhov tseem ceeb ntawm cov nplais nplaum phab ntsa thiab sab nrauv phab ntsa xav tau kev txhim kho kom ntseeg tau zoo thiab ntev ntev.
6. Txhim Kho Sag Kuj
Hauv qee qhov kev thov cov xwm txheej, xws li cov chaw tsim khoom ntsug los yog qab nthab ua haujlwm, xis mas cug sagging yog qhov teeb meem uas nquag muaj. Lub thickening nyhuv ntawm HPMC tuaj yeem txo cov tshuaj txau, txhim kho nws cov chaw tshuaj khib nyiab tuaj yeem tswj tau ruaj khov nyob ib puag ncig. Qhov no tsis tsuas yog txhim kho kev ua haujlwm zoo, tab sis kuj ua kom tau zoo tsim kho.
7. Txhim Kho Cov Hnav Tsis kam
Qhov kev sib txuas ntawm HPMC tuaj yeem nce cov ntom ntom ntawm xis mas cug thiab txo qhov porosity nto, yog li txhim kho nws cov coj nws cov hnav tsis kam. Qhov no yog qhov tseem ceeb hauv cov ntawv thov xws li cov tshuaj hauv av hauv pem teb uas yuav muaj rau lub sijhawm ntev hnav thiab kua muag. HPMC txhawb nqa txoj kab sib hloov muaj cov npoo npoo tom qab ua kom tawv tawv, hnav zoo dua thiab siv sijhawm ntev.
8. Ncua Sijhawm Qhib
HPMC tseem tuaj yeem txuas ntxiv lub neej qhib ntawm cov ntaub ntawv casent-raws li cov khoom siv, uas yog qhov ntev npaum li cas cov khoom tseem ua haujlwm tom qab kev tsim kho. Qhov no muaj txiaj ntsig zoo heev rau cov phiaj xwm uas xav tau sijhawm ntev ua haujlwm. Cov neeg ua haujlwm tuaj yeem hloov kho lossis kho cov ntaub ntawv ua ntej nws tau kho tiav kiag li, uas txhim kho qhov hloov tau thiab yooj yim ntawm kev tsim kho. Cov sij hawm txuas txuas ntxiv tuaj yeem txo cov teeb meem kev tsim cov teeb meem zoo los ntawm kev ua haujlwm qeeb.
9. Tswj npuas ua ke tsim
Hauv qee cov ntawv thov, xws li cov plag tsev rau nws tus kheej, kev tsim cov pa npuas huab tuaj yeem cuam tshuam rau saum npoo du thiab loog. Los ntawm nws cov kev ua ub no thiab cov nyhuv tuab, HPMC tuaj yeem tswj cov npuas, txo cov npuas uas seem, thiab yog li txhim kho qhov zoo ntawm cov khoom tiav.
10. Txhim Kho Cov Dej Kuj
HPMC tuaj yeem txhim kho cov dej tsis kam ntawm cov khoom siv Maas-based los ntawm kev sib sau ua yeeb yaj kiab ntom ntom nti rau saum npoo. Cov yeeb yaj kiab no tsuas yog txwv tsis pub txwv tsis pub nkag mus rau sab nraud noo noo, tab sis kuj txo qis ntawm noo noo, yog li txhim kho lub neej durability thiab kev pabcuam lub neej ntawm cov khoom.
Raws li kev ua haujlwm ntxiv, daim ntawv thov ntawm HPMC hauv cov khoom siv caas-buttance, tab sis kuj tab tom yooj yim thiab kev ruaj ntseg rau cov txheej txheem kev tsim kho. Yog li ntawd, HPMC tau siv dav hauv txoj haujlwm qub niaj hnub no thiab tau dhau los ua ib qho ntawm kev siv cov khoom siv tsis tseem ceeb.
Lub Sijhawm Post: Feb-17-2025