Cellulose ethers yog ib hom polymer uas yaj tau hauv dej uas tsim los ntawm kev hloov kho tshuaj ntawm cellulose. Lawv siv dav hauv cov ntaub ntawv tsim kho, tshwj xeeb tshaj yog thaum siv rau hauv cov av nplaum uas muaj cov teebmeem tseem ceeb.
Cov khoom yooj yim ntawm cellulose ethers
Cellulose ethers yog ib hom polymer tau los ntawm kev kho tshuaj ntawm cov cellulose ntuj. Cov cellulose ethers feem ntau suav nrog hydroxypropyl methylcellulose (HPMC), methylcellulose (MC), carboxymethylcellulose (CMC) thiab lwm yam. Lawv muaj peev xwm solubility zoo thiab thickening, thiab tuaj yeem tsim cov tshuaj colloidal sib xws thiab ruaj khov hauv dej. Cov khoom no ua rau cellulose ethers siv dav hauv cov ntaub ntawv tsim kho.
Cov khoom tseem ceeb ntawm cellulose ethers suav nrog:
Thickening: tuaj yeem ua rau kom cov viscosity ntawm cov kua dej ntau ntxiv.
Kev khaws dej: Nws muaj peev xwm khaws dej tau zoo heev thiab tuaj yeem tiv thaiv dej kom tsis txhob poob thaum lub sijhawm tsim kho.
Cov yam ntxwv ntawm kev tsim zaj duab xis: Nws tuaj yeem tsim ib zaj duab xis sib xws rau ntawm qhov chaw ntawm ib yam khoom los tiv thaiv thiab txhim kho nws.
Lubricity: Txhim kho kev ua tau zoo ntawm cov mortar, ua rau nws yooj yim dua rau kev thov thiab duab.
Lub luag haujlwm tseem ceeb ntawm cellulose ether hauv mortar
Lub luag haujlwm ntawm cellulose ether hauv mortar yog feem ntau pom tseeb hauv cov hauv qab no:
1. Txhim kho kev khaws dej
Cov pob zeb mortar feem ntau yuav muaj teeb meem poob zog thiab tawg vim yog dej poob thaum lub sijhawm tsim kho. Cellulose ether muaj cov dej khaws cia zoo thiab tuaj yeem tsim cov qauv network hauv cov pob zeb mortar kom kaw cov dej noo thiab txo cov dej evaporation thiab poob, yog li txhim kho cov dej khaws cia ntawm cov pob zeb mortar. Qhov no tsis yog tsuas yog ua kom lub sijhawm qhib ntawm cov pob zeb mortar ntev dua, tab sis kuj ua kom ntseeg tau tias cov pob zeb mortar tau txais dej tag nrho thaum lub sijhawm ua kom tawv, ua kom nws lub zog thiab ruaj khov.
2. Txhim kho kev ua haujlwm ntawm kev tsim kho
Qhov ua kom lubricating ntawm cellulose ether ua rau cov mortar du thaum lub sijhawm tsim kho, yooj yim dua rau kev thov thiab kis, thiab txhim kho kev tsim kho kom zoo. Tib lub sijhawm, qhov khoom thickening ntawm cellulose ether ua rau cov mortar muaj thixotropy zoo, uas yog, nws ua nyias dua thaum raug lub zog shear thiab rov qab mus rau nws cov viscosity qub tom qab lub zog shear ploj mus. Cov yam ntxwv no ua rau cov mortar tsis tshua muaj peev xwm sag thaum lub sijhawm tsim kho thiab tswj hwm cov duab zoo.
3. Ua kom cov nplaum ntawm cov mortar nce ntxiv
Cellulose ether tuaj yeem tsim cov qauv sib xws hauv cov mortar, ua rau lub zog nplaum ntawm cov mortar nce ntxiv, thiab txhim kho nws qhov kev nplaum rau lub substrate. Qhov no tuaj yeem tiv thaiv cov mortar kom tsis txhob raug sib cais ntawm cov khoom siv hauv paus thaum lub sijhawm ua kom tawv thiab txo qhov tshwm sim ntawm cov teeb meem zoo xws li hollowing thiab poob tawm.
4. Txhim kho qhov tawg tsis kam
Cov khoom siv ua zaj duab xis ntawm cellulose ether tso cai rau cov mortar los tsim ib zaj duab xis nyias nyias ntawm qhov chaw thaum lub sijhawm ua kom tawv, uas ua lub luag haujlwm tiv thaiv thiab txo qhov cuam tshuam ntawm ib puag ncig sab nraud rau cov mortar. Tib lub sijhawm, cov khoom khaws dej thiab cov khoom tuab kuj tseem tuaj yeem txo cov kab nrib pleb uas tshwm sim los ntawm kev poob dej hauv cov mortar thiab txhim kho nws txoj kev tiv thaiv kab nrib pleb.
Cov teebmeem tshwj xeeb ntawm cellulose ethers rau cov khoom siv mortar
Qhov cuam tshuam tshwj xeeb ntawm cellulose ether rau kev ua haujlwm ntawm mortar tuaj yeem tshuaj xyuas kom meej los ntawm cov hauv qab no:
1. Ua haujlwm tau yooj yim
Cov tshuaj mortar ntxiv nrog cellulose ether ua tau zoo dua hauv kev ua haujlwm. Nws cov dej zoo heev thiab lubricity ua rau cov tshuaj mortar du thaum lub sijhawm tsim kho, yooj yim dua rau kev ua haujlwm, thiab tsis nyuaj rau kev tsim kho. Tib lub sijhawm, cov nyhuv thickening ntawm cellulose ether tuaj yeem txhim kho thixotropy ntawm cov tshuaj mortar, yog li cov tshuaj mortar tuaj yeem khaws nws cov duab zoo thaum lub sijhawm tsim kho thiab tsis yooj yim rau sag thiab sag.
2. Lub zog
Qhov kev khaws dej ntawm cellulose ether ua rau cov mortar khaws cov dej noo txaus thaum lub sijhawm ua kom tawv, txhawb nqa cov tshuaj tiv thaiv hydration ntawm cement, thiab tsim cov qauv khoom hydration nruj dua, yog li txhim kho lub zog ntawm cov mortar. Tsis tas li ntawd, qhov kev faib tawm thiab kev sib txuas ntawm cellulose ether kuj tseem tuaj yeem ua rau cov qauv sab hauv ntawm cov mortar ruaj khov dua, txo qhov tshwm sim ntawm cov kab nrib pleb me me, thiab txhim kho lub zog tag nrho.
3. Kev ruaj khov
Vim tias cellulose ether tuaj yeem tswj tau cov dej noo hauv cov mortar, cov mortar tuaj yeem tsim cov qauv sib xws thaum lub sijhawm ua kom tawv, txo qhov tshwm sim ntawm cov kab nrib pleb, yog li txhim kho qhov ruaj khov ntawm cov mortar. Cov zaj duab xis tsim los ntawm cellulose ether kuj tseem tuaj yeem tiv thaiv qhov chaw ntawm cov mortar rau qee qhov, txo qhov kev puas tsuaj ntawm cov mortar los ntawm ib puag ncig sab nraud, thiab txhim kho nws qhov ruaj khov ntxiv.
4. Kev khaws dej thiab kev tawg tsis kam
Cellulose ether tuaj yeem txhim kho qhov kev khaws dej ntawm cov mortar, ua rau cov mortar khaws cov dej noo txaus thaum lub sijhawm ua kom tawv thiab txo qhov tshwm sim ntawm cov kab nrib pleb shrinkage. Tsis tas li ntawd, cov khoom tsim zaj duab xis ntawm cellulose ether tso cai rau cov mortar tsim cov zaj duab xis tiv thaiv ntawm qhov chaw, txo qhov cuam tshuam ntawm ib puag ncig sab nraud rau cov mortar thiab txhim kho nws txoj kev tiv thaiv kab nrib pleb.
Kev siv cellulose ether hauv cov mortar muaj cov txiaj ntsig zoo heev. Nws qhov kev khaws cia dej zoo heev, ua kom tuab, ua zaj duab xis thiab lubricity tau txhim kho qhov kev ua tau zoo ntawm kev tsim kho, lub zog, kev ruaj khov thiab lwm yam ntawm cov mortar. Yog li ntawd, cellulose ether, ua ib qho khoom ntxiv tseem ceeb, tau siv dav hauv cov ntaub ntawv tsim kho niaj hnub thiab tau dhau los ua ib txoj hauv kev tseem ceeb los txhim kho kev ua tau zoo ntawm mortar.
Lub sijhawm tshaj tawm: Lub Xya Hli-12-2024