Hydroxypropyl Methylcellulose (HPMC)yog cov khoom siv polymer uas yaj tau hauv dej uas siv dav hauv kev tsim kho, tshuaj, khoom noj thiab tshuaj pleev ib ce. Hauv qhov chaw noo noo, kev ua tau zoo ntawm HPMC raug cuam tshuam los ntawm ntau yam, thiab nws cov yam ntxwv txiav txim siab nws qhov kev hloov pauv thiab kev ruaj khov hauv ntau daim ntawv thov.
1. Kev ntub dej
HPMC yog ib yam khoom siv hydrophilic nrog lub zog hygroscopicity. Hauv qhov chaw noo noo, HPMC tuaj yeem nqus cov dej noo los ntawm huab cua, uas feem ntau yog vim muaj ntau pawg hydroxyl thiab methoxy hauv nws cov qauv molecular. Qhov hygroscopicity no ua rau ib txheej dej zaj duab xis tsim rau ntawm qhov chaw ntawm HPMC, ua rau nws pom kev nplua nuj thiab lo zoo dua. Cov yam ntxwv no tseem ceeb heev rau cov ntaub ntawv tsim kho. Piv txwv li, hauv cov nplaum pobzeb thiab hmoov putty, HPMC tuaj yeem txhim kho kev ua haujlwm tsim kho thiab kev khaws dej ntawm cov khoom.
Txawm li cas los xij, qhov hygroscopicity ntau dhau yuav ua rau muaj teeb meem hauv qee qhov kev siv. Piv txwv li, thaum HPMC siv ua cov khoom tswj kev tso tawm hauv cov ntsiav tshuaj tshuaj, kev nqus dej ntau dhau yuav hloov pauv qhov kev tso tawm tshuaj thiab cuam tshuam rau kev ruaj khov ntawm cov tshuaj ua haujlwm. Yog li ntawd, nyob rau hauv qhov chaw noo noo, kev tsim cov qauv ntawm HPMC yuav tsum tau them sai sai rau nws tus cwj pwm hygroscopic.
2. Kev Ruaj Ntseg
HPMC feem ntau ua rau muaj kev ruaj khov tshuaj zoo hauv cov chaw noo noo. Vim yog qhov kev hloov pauv tshwj xeeb ntawm nws cov saw hlau molecular, HPMC ruaj khov nyob rau hauv ob qho tib si acid thiab alkaline ib puag ncig thiab tsis dhau los ua qhov puas tsuaj loj lossis tshuaj lom neeg nyob rau hauv cov av noo siab. Txawm li cas los xij, cov av noo siab yuav muaj qee yam cuam tshuam rau nws cov khoom siv lub cev. Piv txwv li, tus nqi yaj ntawm HPMC yuav raug nrawm dua, thiab nws cov yam ntxwv viscosity yuav hloov pauv vim yog kev nqus dej noo.
Rau cov ntawv thov kev tsim kho, cov chaw muaj av noo siab yuav ua rau cov dej ntws hauv cov tshuaj mortars lossis cov txheej txheem HPMC txo qis, yog li ntawd ntev lub sijhawm ziab ntawm cov khoom. Qee zaum, qhov no yuav zoo dua vim tias nws muab lub sijhawm ua haujlwm ntev dua. Txawm li cas los xij, av noo ntau dhau yuav ua rau lub zog txo qis tom qab ziab lossis tawg ntawm qhov chaw.
3. Kev khaws dej
HPMC muaj cov yam ntxwv zoo heev rau kev khaws dej hauv qhov chaw noo noo. Cov yam ntxwv no ua rau nws yog ib qho khoom siv tseem ceeb hauv kev lag luam kev tsim kho. Piv txwv li, thaum lub sijhawm ua cov txheej txheem plastering phab ntsa, HPMC tuaj yeem tiv thaiv kev poob dej sai sai, yog li ua kom cov mortar muaj sijhawm txaus los ua kom tiav cov tshuaj tiv thaiv hydration thiab txhim kho qhov zoo ntawm kev tsim kho. Hauv qhov chaw noo noo, lub peev xwm khaws dej no tuaj yeem txhim kho ntxiv vim tias cov av noo hauv qhov chaw muab cov dej noo ntxiv rau cov khoom siv.
4. Muaj peev xwm ua yeeb yaj kiab
Lub peev xwm tsim zaj duab xis ntawm HPMC yog qhov tshwj xeeb tshaj yog nyob rau hauv qhov chaw noo noo. Thaum cov tshuaj HPMC raug rau huab cua nrog cov av noo siab, qhov dej evaporation qeeb qeeb, txhawb kev tsim cov zaj duab xis sib xws. Cov zaj duab xis no muaj kev ywj pheej zoo thiab kev tiv thaiv tensile, thiab tuaj yeem muab kev tiv thaiv tawg zoo heev thiab cov khoom tiv thaiv dej rau cov txheej txheem vaj tse. Hauv cov zaub mov thiab tshuaj, cov zaj duab xis HPMC kuj tseem siv tau rau kev txheej thiab tiv thaiv cov khoom xyaw rhiab heev los ntawm kev cuam tshuam ntawm cov chaw noo noo.
5. Kev ntsuas kev ua kom zoo dua hauv cov ntawv thov
Yuav kom ua tau zoo tshaj plaws ntawm HPMC hauv cov chaw noo noo, ntau txoj kev hloov kho tau raug siv rau hauv ntau qhov chaw siv. Piv txwv li, los ntawm kev kho qhov degree ntawm kev hloov pauv ntawm HPMC, nws cov yam ntxwv hygroscopicity thiab viscosity tuaj yeem hloov pauv; hauv cov ntaub ntawv tsim kho, nws qhov kev ua tau zoo ruaj khov hauv cov chaw noo noo tuaj yeem txhim kho ntxiv los ntawm kev sib xyaw nrog lwm cov khoom ntxiv (xws li hmoov latex lossis thickener).
Kev ua tau zoo ntawmHPMCHauv cov chaw noo noo, nws raug cuam tshuam los ntawm ntau yam. Nws qhov hygroscopicity, dej khaws cia thiab zaj duab xis-tsim peev xwm ua rau nws qhia tau tias muaj txiaj ntsig zoo hauv kev siv hauv kev tsim kho, tshuaj thiab zaub mov. Txawm li cas los xij, cov chaw noo noo siab yuav coj qee qhov teeb meem, uas yuav tsum tau daws los ntawm kev tsim qauv kev tshawb fawb thiab kev hloov kho. Los ntawm kev kawm tob txog tus cwj pwm ntawm HPMC hauv cov chaw noo noo, nws cov yam ntxwv tuaj yeem ua tau zoo dua los ua kom tau raws li qhov xav tau ntawm ntau qhov chaw sib txawv.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-24-2024