Cov nyhuv ntawm Hydroxypropyl Methyl Cellulose HPMC ntawm Kev Teeb Lub Sij Hawm ntawm Pob Zeb

Lub sijhawm teeb tsa ntawm pob zeb yog feem ntau cuam tshuam nrog lub sijhawm teeb tsa ntawm cov cement, thiab kev cuam tshuam ntawm kev sib sau tsis zoo. Yog li ntawd, cov nyhuv ntawm hydroxypropyl methylcellulose HPMC nyob rau lub sij hawm teem ntawm underwater non-dispersible qhob sib tov yuav kawm tau los ntawm lub sij hawm ntawm mortar. Txij li thaum lub sijhawm teeb tsa ntawm mortar raug cuam tshuam los ntawm dej, txhawm rau ntsuas qhov cuam tshuam ntawm HPMC ntawm lub sijhawm teeb tsa ntawm mortar, qhov dej-cement ratio thiab mortar ratio ntawm mortar yuav tsum tau kho.

Cov txiaj ntsig kev sim qhia tau hais tias qhov sib ntxiv ntawm hydroxypropyl methylcellulose HPMC muaj qhov cuam tshuam tseem ceeb ntawm cov tshuaj khib nyiab sib xyaw, thiab lub sijhawm teem sijhawm ntawm cov tshuaj khib nyiab yog ncua ntev nrog qhov nce ntawm hydroxypropyl methylcellulose. Nyob rau hauv cov ntaub ntawv ntawm tib cov ntsiab lus HPMC, lub mortar tsim nyob rau hauv dej yog zoo dua li cov mortar tsim nyob rau hauv huab cua. Medium molding yuav siv sij hawm ntev dua los teeb. Thaum ntsuas hauv dej, piv nrog cov qauv dawb, lub sijhawm pib ntawm lub mortar tov nrog hydroxypropyl methylcellulose tau ncua 6-18 teev, thiab lub sijhawm teem sijhawm kawg tau ncua 6-22 teev. Yog li, HPMC yuav tsum tau siv ua ke nrog cov neeg sawv cev thaum ntxov.

HPMC yog lub siab molecular polymer nrog cov qauv macromolecular linear. Nws cov pab pawg ua haujlwm muaj cov pab pawg hydroxyl, uas tuaj yeem tsim cov ntawv cog lus hydrogen nrog cov dej sib xyaw thiab ua kom cov viscosity ntawm cov dej sib xyaw. Qhov ntev molecular chains ntawm HPMC yuav nyiam ib leeg, ua rau HPMC molecules intertwined los tsim ib lub network qauv, qhwv cov cement thiab sib tov dej. Txij li thaum HPMC tsim ib zaj duab xis-zoo li lub network qauv los qhwv cov cement, nws tuaj yeem tiv thaiv cov dej tsis zoo hauv cov mortar, thiab cuam tshuam los yog txo qis cov dej ntawm cov cement.