Hydroxypropyl methylcellulose (HPMC) yog ib qho tshuaj ntxiv uas siv dav hauv cov ntaub ntawv siv hauv kev tsim kho, tshwj xeeb tshaj yog hauv kev tsim cov mortars thiab plasters. HPMC yog ib qho cellulose ether uas tsis yog ionic, yaj tau hauv dej ua los ntawm cov cellulose ntuj uas tau hloov kho tshuaj lom neeg. Nws muaj cov khoom zoo heev uas ua rau tuab, khaws dej, lubricating thiab zaj duab xis, uas ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm, cov khoom siv kho tshuab thiab kev ruaj khov ntawm mortars thiab plasters.
1. Kev txhim kho kev ua haujlwm ntawm kev khaws dej
Ib qho ntawm cov teebmeem tseem ceeb tshaj plaws ntawm HPMC yog nws cov khoom zoo heev uas khaws dej. Hauv cov mortars thiab plasters, HPMC txo qhov ceev uas dej evaporate, ncua lub sijhawm qhib ntawm mortars thiab plasters. Cov khoom no tseem ceeb heev rau kev tsim kho vim nws ua kom cov mortars thiab plasters muaj sijhawm ua haujlwm txaus thaum lub sijhawm tso, zam kev tawg thiab kev sib txuas tsis zoo los ntawm kev qhuav ntxov. Tsis tas li ntawd, kev khaws dej ua kom ntseeg tau tias muaj dej txaus ntawm cov cement, yog li ua rau lub zog kawg ntawm mortars thiab plasters nce ntxiv.
2. Kev txhim kho kev ua tau zoo ntawm kev tsim kho
HPMC txhim kho qhov ua haujlwm ntawm cov mortars thiab plasters. Vim nws cov nyhuv thickening, HPMC tuaj yeem txhim kho qhov viscosity ntawm mortar, ua rau nws yooj yim dua rau kev thov thiab thov. Qhov no tseem ceeb heev rau kev tsim kho phab ntsa thiab qab nthab, vim HPMC ua rau mortars thiab plasters tiv taus kev sagging, txo qhov kev pheej hmoo ntawm kev sagging. Tsis tas li ntawd, qhov cuam tshuam lubrication ntawm HPMC tuaj yeem txhim kho qhov fluidity ntawm mortar thiab faib nws sib npaug rau ntawm cov cuab yeej tsim kho, yog li txhim kho kev tsim kho zoo thiab qhov zoo ntawm qhov chaw.
3. Ua kom muaj kev sib txuas ntxiv
HPMC txhim kho qhov kev sib txuas ntawm cov mortars thiab plasters, tshwj xeeb tshaj yog rau ntawm cov khoom inorganic xws li cib, pob zeb thiab pob zeb. HPMC txhim kho lub zog ntawm cov khoom siv cement los ntawm kev txhim kho lub peev xwm khaws dej ntawm mortar thiab ua kom lub sijhawm ua kom cov cement noo. Tib lub sijhawm, zaj duab xis tsim los ntawm HPMC kuj tseem tuaj yeem ua rau lub zog sib txuas ntawm cov mortar thiab cov khoom siv hauv paus, tiv thaiv cov mortar kom tsis txhob poob lossis tawg.
4. Txhim kho qhov tawg tsis kam
Ntxiv HPMC rau cov mortars thiab plasters tuaj yeem txhim kho lawv txoj kev tiv thaiv kab nrib pleb. Vim yog qhov zoo heev ntawm HPMC khaws dej thiab cov khoom tuab, cov mortar tuaj yeem nyob ntub ntev thaum lub sijhawm ziab, txo cov yas shrinkage thiab qhuav shrinkage tawg los ntawm kev poob dej ntau dhau. Tsis tas li ntawd, cov qauv zoo tsim los ntawm HPMC kuj tseem tuaj yeem ua rau muaj kev ntxhov siab zoo, yog li txo qhov tshwm sim ntawm cov kab nrib pleb.
5. Txhim kho kev tiv thaiv khov-thaw
HPMC kuj tseem txhim kho kev tiv thaiv khov-thaw hauv cov mortars thiab plasters. Cov yam ntxwv khaws dej ntawm HPMC ua rau muaj kev faib tawm ntawm cov dej noo hauv cov mortars thiab plasters, txo qhov kev puas tsuaj ntawm khov-thaw los ntawm cov dej noo. Tsis tas li ntawd, cov zaj duab xis tiv thaiv uas tsim los ntawm HPMC tuaj yeem tiv thaiv kev nkag mus ntawm cov dej noo sab nraud, yog li txo qhov kev puas tsuaj rau cov ntaub ntawv los ntawm cov voj voog khov-thaw thiab txuas ntxiv lub neej kev pabcuam ntawm cov mortars thiab plasters.
6. Txhim kho kev hnav tsis kam
HPMC kuj tseem txhim kho qhov kev tiv thaiv kev hnav ntawm cov mortars thiab plasters. Los ntawm kev txhim kho lub zog sib txuas thiab qhov ntom ntawm cov mortar, HPMC ua rau qhov chaw ntawm cov khoom siv muaj zog dua, txo qhov muaj peev xwm hnav thiab tev tawm. Qhov no tseem ceeb heev rau cov mortars hauv pem teb thiab cov plasters phab ntsa sab nraud, vim tias cov chaw no feem ntau raug kev hnav ntau dua.
7. Txhim kho kev nkag tsis tau
HPMC kuj muaj qhov zoo rau qhov tsis muaj dej nkag ntawm cov mortars thiab plasters. Cov yam ntxwv tsim zaj duab xis ntawm HPMC tsim cov dej tsis nkag tau zoo ntawm cov mortar thiab stucco nto, txo cov dej nkag mus. Tib lub sijhawm, HPMC ua rau cov khoom siv ntom ntom dua, txo cov qhov hws sab hauv, yog li txhim kho qhov kev ua tau zoo ntawm kev tsis muaj dej nkag. Qhov no yog qhov tseem ceeb rau kev tsim cov dej tsis nkag thiab cov dej tsis nkag.
8. Nce sijhawm qhib
Lub sijhawm qhib yog lub sijhawm uas cov mortar lossis stucco tseem nyob hauv qhov xwm txheej ua haujlwm tau. HPMC tuaj yeem ncua lub sijhawm qhib los ntawm nws cov khoom khaws dej, uas yog qhov tseem ceeb heev thaum tsim cov chaw loj lossis ua haujlwm hauv qhov kub thiab txias thiab qhuav. Lub sijhawm qhib ntev tsis yog tsuas yog ua rau kev tsim kho yooj yim xwb tab sis kuj txo cov qhov tsis zoo ntawm kev tsim kho los ntawm mortar lossis plaster qhuav sai dhau.
Kev siv HPMC hauv cov mortars thiab plasters muab kev txhim kho tseem ceeb hauv cov khoom ntau yam ntawm cov ntaub ntawv no. Los ntawm kev ua kom dej khaws cia, txhim kho kev ua haujlwm ntawm kev tsim kho, ua kom lo rau, txhim kho kev tawg thiab khov-thaw tsis kam, thiab txhim kho kev puas tsuaj thiab kev tsis nkag, HPMC muab kev daws teeb meem txhim khu kev qha thiab ruaj khov rau cov ntaub ntawv tsim kho niaj hnub. Cov kev txhim kho kev ua tau zoo no tsis yog tsuas yog ua rau kev tsim kho yooj yim dua thiab ua haujlwm tau zoo, tab sis kuj ua kom lub tsev ruaj khov thiab ruaj khov mus sij hawm ntev hauv ntau qhov chaw ib puag ncig sib txawv. Yog li ntawd, HPMC tau dhau los ua ib qho tseem ceeb thiab tseem ceeb hauv cov mortar thiab stucco formulations.
Lub sijhawm tshaj tawm: Cuaj hlis-03-2024