Hydroxypropyl methylcellulose (HPMC) yog ib qho kev ua tau zoo ntxiv uas siv dav hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv kev tsim cov mortars thiab plasters. HPMC yog ib qho nonionic, dej-soluble cellulose ether ua los ntawm chemically modified natural cellulose. Nws muaj cov thickening zoo heev, dej tuav, lubricating thiab zaj duab xis-tsim cov khoom, uas ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm, cov khoom siv kho tshuab thiab ua haujlwm ntev ntawm mortars thiab plasters.
1. Kev txhim kho cov dej tuav tau zoo
Ib qho ntawm cov txiaj ntsig tseem ceeb tshaj plaws ntawm HPMC yog nws cov dej tuav zoo heev. Hauv mortars thiab plasters, HPMC txo qis tus nqi ntawm cov dej evaporates, ncua sij hawm qhib ntawm mortars thiab plasters. Cov cuab yeej no tseem ceeb heev rau kev tsim kho vim tias nws ua kom cov mortars thiab plasters muaj lub sijhawm ua haujlwm txaus thaum lub sijhawm tso, tsis txhob tawg thiab kev sib txuas tsis zoo los ntawm kev ziab ntxov. Tsis tas li ntawd, kev tuav dej ua kom muaj dej txaus ntawm cov cement, yog li ua kom lub zog kawg ntawm mortars thiab plasters.
2. Kev txhim kho kev tsim kho kev ua haujlwm
HPMC txhim kho kev ua haujlwm ntawm mortars thiab plasters. Vim nws cov nyhuv thickening, HPMC tuaj yeem txhim kho cov viscosity ntawm mortar, ua kom yooj yim rau kev thov thiab thov. Qhov no yog qhov tseem ceeb tshwj xeeb rau kev tsim kho phab ntsa thiab qab nthab, vim HPMC ua rau cov mortars thiab plasters tiv taus sagging, txo qhov kev pheej hmoo ntawm sagging. Tsis tas li ntawd, cov nyhuv lubrication ntawm HPMC tuaj yeem txhim kho qhov fluidity ntawm mortar thiab faib nws tusyees ntawm cov cuab yeej siv, yog li txhim kho kev tsim kho kom zoo thiab qhov chaw zoo.
3. Ua kom adhesion
HPMC txhim kho qhov adhesion ntawm mortars thiab plasters, tshwj xeeb tshaj yog nyob rau hauv inorganic substrates xws li cib, pob zeb thiab pob zeb nto. HPMC txhim kho lub zog ntawm cov khoom siv cement los ntawm kev txhim kho cov dej tuav lub peev xwm ntawm cov mortar thiab ncua sij hawm cov dej tshuaj tiv thaiv ntawm cov cement. Nyob rau tib lub sijhawm, cov yeeb yaj kiab tsim los ntawm HPMC tuaj yeem ua rau muaj kev sib txuas sib txuas ntawm cov tshuaj khib nyiab thiab cov khoom siv hauv paus, tiv thaiv cov mortar los ntawm kev poob lossis tawg.
4. Txhim khu kev ua haujlwm tawg
Ntxiv HPMC rau mortars thiab plasters tuaj yeem txhim kho lawv cov kab nrib pleb. Vim tias cov dej tuav tau zoo thiab cov khoom ua kom tuab ntawm HPMC, cov tshuaj khib nyiab tuaj yeem ntub tau ntev thaum lub sijhawm ziab, txo cov yas shrinkage thiab qhuav shrinkage tawg los ntawm dej ntau dhau. Tsis tas li ntawd, cov qauv zoo tsim los ntawm HPMC kuj tuaj yeem cuam tshuam kev ntxhov siab, yog li txo qhov tshwm sim ntawm cov kab nrib pleb.
5. Txhim kho khov-thaw tsis kam
HPMC kuj txhim kho khov-thaw tiv thaiv hauv mortars thiab plasters. Cov dej tuav cov khoom ntawm HPMC pab kom txawm tias faib cov dej noo nyob rau hauv mortars thiab plasters, txo qhov khov-thaw puas los ntawm noo noo concentration. Tsis tas li ntawd, cov yeeb yaj kiab tiv thaiv tsim los ntawm HPMC tuaj yeem tiv thaiv kev nkag mus ntawm cov dej noo sab nraud, yog li txo kev puas tsuaj rau cov ntaub ntawv los ntawm kev khov-thaw cycles thiab ncua kev pab cuam lub neej ntawm mortars thiab plasters.
6. Txhim khu kev hnav tsis kam
HPMC kuj txhim kho qhov hnav tsis kam ntawm mortars thiab plasters. Los ntawm kev txhim kho lub zog sib txuas thiab cov qauv ntom ntom ntawm cov mortar, HPMC ua rau lub ntsej muag ntawm cov khoom muaj zog, txo qhov muaj peev xwm hnav thiab tev. Qhov no yog ib qho tseem ceeb tshwj xeeb rau hauv pem teb mortars thiab sab nrauv phab ntsa plasters, vim hais tias cov cheeb tsam no feem ntau raug rau cov neeg kho tshuab ntau dua.
7. Txhim kho impermeability
HPMC kuj tseem muaj txiaj ntsig zoo rau cov impermeability ntawm mortars thiab plasters. Cov cuab yeej ua yeeb yaj kiab ntawm HPMC tsim cov khoom siv dej tsis zoo ntawm cov mortar thiab stucco, txo cov dej nkag. Nyob rau tib lub sijhawm, HPMC txhim kho qhov ntom ntom ntawm cov khoom, txo cov pores sab hauv, yog li ntxiv kev txhim kho impermeability. Qhov no yog qhov tseem ceeb tshwj xeeb rau kev tsim cov dej tsis zoo thiab cov dej pov thawj.
8. Ntxiv sijhawm qhib
Lub sijhawm qhib yog hais txog lub sijhawm uas lub mortar lossis stucco tseem nyob hauv qhov chaw ua haujlwm. HPMC tuaj yeem txuas ntxiv lub sijhawm qhib los ntawm nws cov khoom tuav dej, uas yog qhov tseem ceeb heev thaum tsim cov cheeb tsam loj lossis ua haujlwm hauv qhov kub thiab txias. Lub sijhawm qhib txuas ntxiv tsis yog tsuas yog ua kom yooj yim rau kev tsim kho tab sis kuj txo cov kev tsim kho tsis xws luag los ntawm mortar lossis plaster kom qhuav sai sai.
Kev siv HPMC hauv mortars thiab plasters muab kev txhim kho tseem ceeb hauv cov khoom siv ntau yam ntawm cov ntaub ntawv no. Los ntawm kev ua kom dej tuav, txhim kho kev tsim kho, ua kom adhesion, txhim kho kev tawg thiab khov-thaw, thiab txhim kho puas thiab impermeability, HPMC muab cov kev daws teeb meem ntau dua thiab ruaj khov rau cov khoom siv hauv tsev niaj hnub. Cov kev txhim kho kev ua tau zoo no tsis tsuas yog ua rau kev tsim kho yooj yim dua thiab ua haujlwm tau zoo, tab sis kuj ua kom lub sijhawm ntev thiab ruaj khov ntawm lub tsev nyob rau hauv ib puag ncig sib txawv. Yog li ntawd, HPMC tau dhau los ua ib qho tseem ceeb thiab tseem ceeb muaj nyob rau hauv mortar thiab stucco formulations.
Post lub sij hawm: Sep-03-2024