Hydroxypropyl Methylcellulose (HPMC) yog ib qho polymer uas yaj tau hauv dej uas siv dav hauv cov ntaub ntawv tsim kho, tshwj xeeb tshaj yog cov nplaum pobzeb uas ua los ntawm cement. Cov yam ntxwv tshuaj lom neeg thiab cov yam ntxwv lub cev ntawm HPMC ua rau nws ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev nplaum, kev ua haujlwm ntawm kev tsim kho, thiab kev ruaj khov ntawm cov nplaum pobzeb.
(1) Kev paub txog HPMC
1. Cov qauv tshuaj ntawm HPMC
HPMC yog ib qho cellulose derivative tau los ntawm kev hloov kho tshuaj cellulose ntuj. Nws cov qauv feem ntau yog tsim los ntawm methoxy (-OCH₃) thiab hydroxypropoxy (-CH₂CHOHCH₃) pawg hloov qee pawg hydroxyl ntawm cov saw cellulose. Cov qauv no muab HPMC zoo solubility thiab hydration muaj peev xwm.
2. Cov khoom siv lub cev ntawm HPMC
Kev yaj: HPMC tuaj yeem yaj rau hauv dej txias los tsim cov tshuaj colloidal pob tshab thiab muaj peev xwm ua kom noo thiab tuab.
Thermogelation: Cov kua HPMC yuav tsim ib lub gel thaum cua sov thiab rov qab mus rau lub xeev kua tom qab txias.
Kev ua haujlwm ntawm qhov chaw: HPMC muaj kev ua haujlwm zoo ntawm qhov chaw hauv cov kua, uas pab tsim cov qauv npuas ruaj khov.
Cov yam ntxwv tshwj xeeb ntawm lub cev thiab tshuaj no ua rau HPMC yog cov khoom siv zoo tshaj plaws rau kev hloov kho cov nplaum pob zeb ua los ntawm cement.
(2) Txoj kev ua haujlwm ntawm HPMC txhim kho kev ua tau zoo ntawm cov nplaum pob zeb cement
1. Txhim kho kev khaws dej
Lub Ntsiab Cai: HPMC tsim cov qauv sib txuas ua ke hauv cov tshuaj, uas tuaj yeem kaw cov dej noo tau zoo. Lub peev xwm khaws dej no yog vim muaj ntau pawg hydrophilic (xws li pawg hydroxyl) hauv HPMC molecules, uas tuaj yeem nqus thiab khaws cov dej noo ntau.
Txhim kho kev nplaum: Cov nplaum pobzeb uas ua los ntawm cement xav tau dej noo los koom nrog cov tshuaj tiv thaiv dej thaum lub sijhawm ua kom tawv. HPMC tswj tau qhov muaj dej noo, ua rau cov cement noo tag nrho, yog li txhim kho kev nplaum ntawm cov nplaum.
Ntev lub sijhawm qhib: Kev khaws dej tiv thaiv cov nplaum kom tsis txhob qhuav sai thaum lub sijhawm tsim kho, ntev lub sijhawm kho rau kev tso pobzeb.
2. Txhim kho kev ua haujlwm ntawm kev tsim kho
Lub hauv paus ntsiab lus: HPMC muaj cov nyhuv ua kom tuab zoo, thiab nws cov molecules tuaj yeem tsim cov qauv zoo li network hauv cov kua dej, yog li ua rau cov viscosity ntawm cov kua nce ntxiv.
Txhim kho cov khoom tiv thaiv kev sagging: Cov slurry thickened muaj cov khoom tiv thaiv kev sagging zoo dua thaum lub sijhawm tsim kho, yog li cov vuas tuaj yeem nyob ruaj khov hauv qhov chaw tau teem tseg thaum lub sijhawm paving thiab yuav tsis swb vim yog lub ntiajteb txawj nqus.
Txhim kho qhov fluidity: Qhov viscosity tsim nyog ua rau cov nplaum yooj yim rau kev thov thiab kis thaum lub sijhawm tsim kho, thiab tib lub sijhawm muaj kev ua haujlwm zoo, txo qhov nyuaj ntawm kev tsim kho.
3. Txhim kho kev ruaj khov
Lub hauv paus ntsiab lus: HPMC ua rau kom cov dej khaws cia thiab lo rau ntawm cov nplaum, yog li ua kom cov nplaum pobzeb raws li cement ruaj khov.
Txhim kho lub zog sib txuas: Cov cement uas muaj dej txaus ua rau muaj kev sib txuas zoo dua thiab tsis yooj yim poob lossis tawg thaum siv ntev.
Txhim kho kev tiv thaiv kab nrib pleb: Kev khaws dej zoo tiv thaiv kev loj hlob ntawm cov nplaum thaum lub sijhawm ziab, yog li txo qhov teeb meem tawg los ntawm kev ntsws.
(3) Kev txhawb nqa cov ntaub ntawv sim
1. Kev sim khaws dej
Cov kev tshawb fawb tau qhia tias qhov ceev ntawm kev khaws dej ntawm cov nplaum pob zeb ua los ntawm cement nrog kev ntxiv ntawm HPMC tau zoo dua qub. Piv txwv li, kev ntxiv 0.2% HPMC rau cov nplaum tuaj yeem ua rau qhov ceev ntawm kev khaws dej nce ntxiv los ntawm 70% mus rau 95%. Qhov kev txhim kho no yog qhov tseem ceeb rau kev txhim kho lub zog sib txuas thiab kev ruaj khov ntawm cov nplaum.
2. Kev sim viscosity
Qhov ntau ntawm HPMC ntxiv rau muaj qhov cuam tshuam loj rau qhov viscosity. Ntxiv 0.3% HPMC rau cov nplaum cement-based vuas tuaj yeem ua rau qhov viscosity ntau zaus, kom ntseeg tau tias cov nplaum muaj kev ua tau zoo tiv thaiv kev sagging thiab kev ua haujlwm ntawm kev tsim kho.
3. Kev sim lub zog ntawm daim ntawv cog lus
Los ntawm kev sim sib piv, nws pom tias lub zog sib txuas ntawm cov vuas thiab cov khoom siv ntawm cov nplaum uas muaj HPMC zoo dua li cov nplaum uas tsis muaj HPMC. Piv txwv li, tom qab ntxiv 0.5% HPMC, lub zog sib txuas tuaj yeem nce ntxiv txog li 30%.
(4) Piv txwv ntawm daim ntawv thov
1. Kev tso cov vuas pem teb thiab cov vuas phab ntsa
Thaum muab cov vuas pem teb thiab cov vuas phab ntsa tso rau hauv tsev, cov nplaum uas muaj HPMC ua rau cov vuas cement zoo dua qub tau pom tias muaj kev ua tau zoo dua thiab sib txuas tau ntev. Thaum lub sijhawm tsim kho, cov nplaum tsis yooj yim poob dej sai, ua kom cov vuas du thiab tiaj tus.
2. Lub kaw lus rwb thaiv tsev phab ntsa sab nraud
Cov nplaum uas muaj HPMC ntxiv kuj siv dav hauv cov txheej txheem rwb thaiv tsev phab ntsa sab nraud. Nws qhov kev tuav dej zoo heev thiab kev nplaum ua kom muaj kev sib txuas zoo ntawm lub rooj tsavxwm rwb thaiv tsev thiab phab ntsa, yog li ua kom lub zog thiab kev ruaj khov ntawm cov txheej txheem rwb thaiv tsev phab ntsa sab nraud zoo dua.
Kev siv HPMC hauv cov nplaum pob zeb ua los ntawm cement ua rau cov nplaum ua haujlwm tau zoo dua. Los ntawm kev txhim kho kev khaws dej, txhim kho kev ua haujlwm ntawm kev tsim kho thiab txhim kho kev ruaj khov, HPMC ua rau cov nplaum pob zeb ua los ntawm cement tsim nyog dua rau cov kev xav tau kev tsim kho niaj hnub. Nrog rau kev txhim kho thev naus laus zis thiab kev thov ntau ntxiv rau cov ntaub ntawv ua haujlwm siab, kev siv HPMC yuav dav dua.
Lub sijhawm tshaj tawm: Lub Rau Hli-26-2024