Cov hmoov putty feem ntau yog siv rau kev kho thiab kho phab ntsa thaum lub sijhawm tsim kho. Txawm li cas los xij, cov hmoov putty ib txwm muaj feem yuav yaj thiab mos thaum raug dej, cuam tshuam rau qhov zoo ntawm kev tsim kho thiab lub neej ua haujlwm ntawm lub tsev. Hydroxypropyl methylcellulose (HPMC), ua ib qho khoom siv tseem ceeb, tuaj yeem txhim kho qhov tsis kam dej ntawm cov hmoov putty.
1. Cov khoom siv tshuaj lom neeg thiab cov haujlwm yooj yim ntawm HPMC
Hydroxypropyl methylcellulose (HPMC) yog ib qho cellulose ether uas tsis yog ionic nrog ntau yam kev ua haujlwm xws li thickening, film-forming, stabilization, thiab wetting. Nws yog dav siv rau hauv cov ntaub ntawv siv hauv tsev, tshuaj, khoom noj thiab lwm yam teb. Cov qauv molecular ntawm HPMC muaj cov hydrophilic hydroxyl pawg (-OH) thiab hydrophobic hydrocarbon pawg (-CH3, -CH2-), ua rau nws zoo solubility thiab stability. Cov khoom no ua rau HPMC tsim cov tshuaj colloidal ruaj khov hauv dej thiab tsim cov qauv network ntom ntom thaum lub sijhawm kho, yog li txhim kho cov khoom siv lub cev ntawm cov khoom.
2. Txoj kev los txhim kho kev tiv thaiv dej
2.1. Cov nyhuv ua kom tuab
HPMC tuaj yeem ua rau kom cov hmoov putty viscosity ntau ntxiv, ua rau cov slurry tsim kom muaj lub kaw lus ncua kev ruaj khov dua hauv dej. Ntawm ib sab tes, qhov cuam tshuam no ua rau kev ua haujlwm ntawm cov slurry zoo dua thiab txo qhov tshwm sim ntawm kev tawg thiab los ntshav; ntawm qhov tod tes, los ntawm kev tsim cov slurry viscous, HPMC txo qhov nkag mus ntawm cov dej molecules, yog li txhim kho qhov ua tau zoo ntawm cov hmoov putty. Tiv thaiv dej tom qab kho.
2.2. Cov yam ntxwv ua zaj duab xis
Thaum lub sijhawm kho cov hmoov putty, HPMC yuav tsim ib daim zaj duab xis ntom ntom ntawm cov cement, dej thiab lwm yam khoom xyaw. Daim nyias nyias no muaj qhov kis tau dej tsawg thiab tuaj yeem thaiv kev nkag mus ntawm cov dej noo. Daim zaj duab xis tsim los ntawm HPMC kuj tseem tuaj yeem txhim kho lub zog kho tshuab thiab kev hnav tsis kam ntawm cov khoom siv, ntxiv txhim kho qhov tsis kam dej ntawm cov hmoov putty.
2.3. Txhim kho kev tiv thaiv kab nrib pleb
Los ntawm kev txhim kho cov elastic modulus thiab cov yam ntxwv shrinkage ntawm cov hmoov putty, HPMC tuaj yeem txo qhov kev pheej hmoo ntawm kev tawg los ntawm kev qhuav shrinkage thiab kev hloov pauv kub. Kev txo qhov tshwm sim ntawm cov kab nrib pleb kuj tseem yuav pab txhim kho qhov tsis kam dej ntawm cov hmoov putty, vim tias cov kab nrib pleb yuav dhau los ua cov channel tseem ceeb rau kev nkag mus rau hauv dej.
2.4. Kev tswj hwm cov tshuaj tiv thaiv dej
HPMC tuaj yeem ncua qhov kev ua kom cov cement noo noo, ua rau cov hmoov putty muaj sijhawm ntev dua los kho nws tus kheej thiab ua kom ntom thaum lub sijhawm ua kom tawv. Qhov kev ua kom cov dej noo qeeb pab tsim cov qauv me me, yog li txo qhov porosity ntawm cov hmoov putty thiab txhim kho kev ua haujlwm tsis muaj dej ntawm cov khoom.
3. Daim ntawv thov cov nyhuv ntawm HPMC hauv putty hmoov
3.1. Txhim kho kev ua haujlwm ntawm kev tsim kho
HPMC ua kom cov khoom rheological ntawm cov putty slurry zoo dua, ua rau nws yooj yim dua rau cov neeg ua haujlwm tsim kho kom ua tiav kev khawb thiab ua kom du. Vim nws cov khoom zoo heev uas ua rau tuab thiab khaws dej, cov hmoov putty tuaj yeem tswj tau qhov dej noo thaum siv, txo qhov tshwm sim ntawm cov kab nrib pleb qhuav thiab txhim kho qhov zoo ntawm kev tsim kho.
3.2. Txhim kho cov khoom siv kho tshuab ntawm cov khoom tiav lawm
Cov hmoov putty uas ntxiv rau HPMC muaj lub zog siab thiab kev nplaum tom qab kho kom zoo, txo qhov ua rau tawg thiab tev tawm. Qhov no ua rau lub tsev zoo nkauj thiab ruaj khov dua.
3.3. Txhim kho qhov tsis kam dej ntawm cov txheej txheej kawg
Cov kev sim qhia tau hais tias lub zog ntawm cov hmoov putty ntxiv nrog HPMC txo qis me ntsis tom qab raug tsau rau hauv dej, thiab nws qhia tau tias muaj kev tiv thaiv hydrolysis zoo dua thiab ruaj khov. Qhov no ua rau cov hmoov putty siv HPMC tsim nyog dua rau kev xav tau kev tsim kho hauv cov chaw noo noo.
4. Kev ceev faj rau kev siv
Txawm hais tias HPMC muaj qhov cuam tshuam tseem ceeb rau kev txhim kho cov dej tsis kam ntawm cov hmoov putty, cov ntsiab lus hauv qab no yuav tsum tau sau tseg hauv kev siv ua haujlwm:
4.1. Xaiv cov tshuaj kom raug
Qhov ntau npaum li cas ntawm HPMC yuav tsum tau kho kom haum raws li cov mis thiab cov kev cai ntawm cov hmoov putty. Kev siv ntau dhau yuav ua rau cov slurry viscous dhau, cuam tshuam rau kev ua haujlwm ntawm kev tsim kho; kev siv tsis txaus yuav tsis ua rau nws cov thickening thiab zaj duab xis tsim.
4.2. Kev sib xyaw nrog lwm cov khoom ntxiv
HPMC feem ntau siv ua ke nrog lwm cov cellulose ethers, hmoov latex, plasticizers thiab lwm yam khoom ntxiv kom ua tiav cov txiaj ntsig zoo dua. Kev xaiv thiab kev sib phim ntawm cov khoom ntxiv no tuaj yeem ua kom zoo dua qhov kev ua tau zoo ntawm cov hmoov putty.
4.3. Tswj qhov kub thiab txias thiab av noo ntawm ib puag ncig
Cov khoom siv khaws dej ntawm HPMC yuav raug cuam tshuam thaum siv rau hauv qhov kub thiab txias lossis qhov av noo qis. Kev tsim kho yuav tsum tau ua nyob rau hauv qhov kub thiab txias thiab av noo kom ntau li ntau tau, thiab yuav tsum tau them sai sai rau kev tswj cov dej noo ntawm cov slurry.
HPMC ua tau zoo dua qhov tsis kam dej ntawm cov hmoov putty los ntawm ntau txoj hauv kev xws li tuab, tsim zaj duab xis, txhim kho kev tiv thaiv kab nrib pleb thiab tswj cov tshuaj tiv thaiv dej, ua rau nws muaj kev ruaj khov zoo thiab ruaj khov hauv qhov chaw noo noo. Qhov no tsis yog tsuas yog txhim kho qhov zoo thiab kev ua haujlwm ntawm kev tsim kho vaj tse, tab sis kuj ua rau lub neej ua haujlwm ntawm lub tsev ntev dua. Hauv kev siv tiag tiag, kev xaiv thiab siv HPMC thiab lwm yam khoom ntxiv tuaj yeem ua kom zoo dua qhov kev ua tau zoo ntawm cov hmoov putty thiab ua tiav cov txiaj ntsig zoo dua ntawm kev tsim kho.
Lub sijhawm tshaj tawm: Lub Rau Hli-26-2024