Hydroxypropyl methylcellulose (HPMC) nyob rau hauv ntub sib tov mortar

Lub luag haujlwm ntawmHPMC nyob rau hauv ntub-mixed mortar

Cov khoom sib xyaw ntub dej yog cov cement, nplua aggregate, admixture, dej thiab ntau yam khoom txiav txim siab raws li kev ua tau zoo. Raws li ib qho kev faib ua feem, tom qab tau ntsuas thiab sib xyaw hauv qhov chaw sib tov, nws raug thauj mus rau qhov chaw siv los ntawm lub tsheb sib tov, thiab muab tso rau hauv ib qho tshwj xeeb Cov sib xyaw ntub dej yog khaws cia rau hauv lub thawv thiab siv nyob rau hauv lub sijhawm teev.

Hydroxypropyl methylcellulose yog siv los ua tus neeg sawv cev tiv thaiv rau cov cement slurry thiab ua ib qho retarder kom cov slurry twj tso kua mis. Hydroxypropyl-Methyl Cellulose HPMC Cellulose lub peev xwm moisturizing raws li cov kua nplaum ua kom cov txiaj ntsig ntawm dab thiab ncua sijhawm ua haujlwm. Qhov no tso cai rau cov noob hnav kom tsis txhob tawg sai heev tom qab lubrication thiab ua kom muaj zog tom qab ziab. . Hydrochloric acid yog ib qho tseem ceeb ntawm HPMC rau hydrolyze cellulose, thiab nws yog ib qho chaw tsim khoom ntawm ntau cov pulps hauv Suav teb. Cov yam ntxwv cuam tshuam rau ntub slurry suav nrog HPMC ntxiv nyiaj, HPMC viscosity, particle fineness thiab ambient kub.

Lub luag haujlwm tseem ceeb ntawm HPMC hauv kev sib xyaw ntub dej yog qhov tseem ceeb hauv peb yam: ib qho yog cov dej tuav tau zoo, lwm qhov yog kev cuam tshuam ntawm kev sib xws thiab kev hnov ​​​​mob ntawm cov ntub dej sib tov, thiab lwm qhov yog kev sib cuam tshuam nrog cov cement. Tus nqi ntawm cov cellulose ether nyob ntawm qhov nqus ntawm cov dej los ntawm lub substrate, muaj pes tsawg leeg ntawm cov xuab zeb, lub thickness ntawm txheej, qhov xav tau rau cov dej hauv kev daws, thiab lub sij hawm condensation ntawm cov khoom.

Moisture tuav yam cuam tshuam rau hydrolyzed cellulose muaj xws li pulp viscosity, ntxiv tus nqi, particle fineness thiab kub. Lub thicker lub cellulose ether, qhov zoo dua cov dej kuj. Viscosity yog qhov tseem ceeb ntawm kev ua haujlwm ntawm HPMC. Rau tib yam khoom, cov viscosity tau ntsuas los ntawm ntau txoj kev sib txawv heev, thiab qee qhov txawm mus txog geometric progression. Yog li ntawd, txhawm rau sib piv cov viscosities, nws yuav tsum tau ua ntawm tib txoj kev sim, nrog rau qhov kub thiab txias, spindle, thiab lwm yam.

Feem ntau hais lus, qhov siab dua qhov viscosity, qhov zoo dua cov dej tsis zoo. Tab sis qhov ntau dua qhov nce hauv viscosity, HPMC, qhov siab dua qhov hnyav molecular, qis dua cov khoom solubility, cov tshuaj muaj zog, thiab cov khoom muaj kev cuam tshuam tsis zoo. Qhov siab dua qhov viscosity, qhov zoo dua cov nyhuv thickening hauv kev daws, tab sis tsis ncaj qha proportional rau qhov piv. Qhov siab dua qhov viscosity, qhov ntub dej thiab cov kua nplaum ntau dua, thaum lub tsev, qhia tau hais tias muaj kev tiv thaiv siab nyob rau hauv muaj cov nplaum nplaum thiab cov ntaub ntawv. Tab sis ntxiv cov txheej txheem lub zog rau cov mortar ntub nws tus kheej yuav tsis pab. Thaum ob lub tsev tau tsim, pom tias qhov kev tiv thaiv yoov tshaj cum tau ploj lawm. Hauv qhov sib piv, qee qhov qis-viscosity tom qab hloov kho methacrylic acid, thaum cellulose txhim kho cov kua dej ntub thiab cov qauv tsim, muaj cov khoom zoo heev.