Hydroxypropyl methylcellulose yog ib qho cellulose ether uas tsis yog ionic uas tau ua los ntawm paj rwb zoo los ntawm ntau yam kev tshuaj lom neeg. Nws yog ib qho tsis muaj ntxhiab, tsis muaj tshuaj lom dawb uas yaj hauv dej thiab muaj cov kua colloidal ntshiab lossis me ntsis pos huab. Nws muaj cov yam ntxwv ntawm kev tuab, khaws dej thiab yooj yim tsim. Cov kua dej ntawm hydroxypropyl methylcellulose HPMC ruaj khov heev hauv HP3.0-10.0, thiab thaum nws tsawg dua 3 lossis ntau dua 10, qhov viscosity yuav raug txo qis heev.
Lub luag haujlwm tseem ceeb ntawm hydroxypropyl methylcellulose hauv cov cement mortar thiab putty hmoov yog kev khaws cia dej thiab thickening, uas tuaj yeem txhim kho qhov cohesion thiab sag tsis kam ntawm cov ntaub ntawv.
Cov yam xws li kub thiab cua ceev yuav cuam tshuam rau qhov volatilization tus nqi ntawm cov dej noo hauv mortar, putty thiab lwm yam khoom, yog li nyob rau hauv ntau lub caij sib txawv, cov dej khaws cia cov khoom nrog tib tus nqi ntawm cellulose ntxiv kuj yuav muaj qee qhov sib txawv. Hauv kev tsim kho tshwj xeeb, cov dej khaws cia cov slurry tuaj yeem hloov kho los ntawm kev nce lossis txo qhov ntau ntawm HPMC ntxiv. Cov dej khaws cia ntawm hydroxypropyl methylcellulose HPMC ntawm qhov kub siab yog qhov qhia tseem ceeb los qhia qhov txawv ntawm qhov zoo ntawm HPMC. HPMC zoo heev tuaj yeem daws qhov teeb meem ntawm kev khaws cia dej nyob rau hauv qhov kub siab. Hauv lub caij qhuav thiab thaj chaw uas muaj qhov kub siab thiab cua ceev, nws yog qhov tsim nyog los siv cov HPMC zoo los txhim kho kev ua haujlwm khaws cia dej ntawm slurry.
Yog li ntawd, thaum lub caij ntuj sov kub siab, txhawm rau kom ua tiav cov txiaj ntsig khaws cia dej, nws yog qhov tsim nyog los ntxiv cov HPMC zoo txaus raws li cov mis, txwv tsis pub yuav muaj teeb meem zoo xws li tsis txaus dej, txo lub zog, tawg, hollowing thiab shedding los ntawm kev qhuav sai dhau, thiab tib lub sijhawm kuj ua rau muaj teeb meem ntawm tus neeg ua haujlwm tsim kho. Thaum qhov kub poob qis, qhov ntau ntawm HPMC ntxiv tuaj yeem maj mam txo qis, thiab tib yam dej tuav tau tuaj yeem ua tiav.
Hauv kev tsim cov ntaub ntawv siv hauv tsev, hydroxypropyl methylcellulose yog ib qho khoom siv ntxiv uas tsis tuaj yeem tsis tau. Tom qab ntxiv HPMC, cov khoom hauv qab no tuaj yeem txhim kho tau:
1. Kev khaws dej: Txhim kho kev khaws dej, txhim kho cov cement mortar, cov hmoov qhuav qhuav sai dhau thiab tsis txaus hydration ua rau tsis zoo hardening, tawg thiab lwm yam phenomena.
2. Kev nplaum: Vim yog qhov zoo dua ntawm cov mortar, nws tuaj yeem sib txuas zoo dua cov substrate thiab cov adherend.
3. Tiv thaiv kev sagging: Vim nws cov nyhuv thickening, nws tuaj yeem tiv thaiv kev slippage ntawm mortar thiab cov khoom lo thaum lub sijhawm tsim kho.
4. Kev Ua Haujlwm Tau: Ua kom cov mortar plasticity ntau ntxiv, txhim kho kev lag luam ntawm kev tsim kho thiab txhim kho kev ua haujlwm zoo.
Lub sijhawm tshaj tawm: Plaub Hlis-12-2023