Yuav ua li cas kuaj cov viscosity ntawm hydroxypropyl methylcellulose?

Hydroxypropyl methylcellulose rau kev tsim kho yuav tsum zam kom tsis txhob muaj dej nkag mus rau hauv phab ntsa, thiab kev khaws cia ntawm cov dej tsim nyog hauv cov mortar tuaj yeem ua rau cov cement ua haujlwm zoo rau cov dej thiab dej. Hydroxypropyl methylcellulose lub viscosity ntawm cellulose nyob rau hauv mortar yog ncaj qha proportional, siab dua lub viscosity, qhov zoo dua cov dej tuav ntawm hydroxypropyl methylcellulose.

Thaum cov dej noo ntawm hydroxypropyl methylcellulose siab dhau lawm, cov dej khaws cia ntawm hydroxypropyl methylcellulose yuav txo qis, uas yuav ncaj qha ua rau txo qis kev tsim kho ntawm hydroxypropyl methylcellulose. Peb kuj paub txog tej yam uas yooj yim dua ua yuam kev. Peb yuav tsum nco ntsoov khaws nws tshiab thiab peb yuav tau txais cov txiaj ntsig tsis tau xav txog.

Pom meej viscosity yog qhov qhia tseem ceeb ntawm hydroxypropyl methylcellulose. Cov kev txiav txim ib txwm muaj yog rotational viscometry, capillary viscometry thiab poob lub caij nplooj zeeg viscometry.

Yav dhau los, txoj kev txiav txim siab ntawm hydroxypropyl methylcellulose yog capillary viscometry, siv lub ubbelohde viscometer. Feem ntau qhov kev txiav txim siab yog cov kua dej ntawm 2, thiab cov mis yog: V = Kdt. V sawv cev rau lub viscosity, chav tsev yog, K yog qhov tas li ntawm lub viscometer, d sawv cev rau qhov ceev ntawm qhov kub thiab txias, t yog hais txog lub sij hawm los ntawm sab saum toj mus rau hauv qab ntawm lub viscometer, chav tsev yog thib ob s. Txoj kev no yog qhov nyuaj rau kev khiav lag luam, thiab yog tias muaj cov khoom tsis zoo, nws yooj yim los ua qhov yuam kev, thiab nws nyuaj rau txheeb xyuas qhov zoo ntawm hydroxypropyl methylcellulose.

Qhov teeb meem ntawm delamination ntawm kev tsim cov kua nplaum yog ib qho teeb meem loj uas cov neeg siv khoom tau ntsib. Ua ntej ntawm tag nrho cov, qhov teeb meem ntawm raw cov ntaub ntawv yuav tsum tau txiav txim siab nyob rau hauv lub delamination ntawm kev tsim kho kua nplaum. Lub ntsiab yog vim li cas rau delamination ntawm kev tsim kua nplaum yog polyvinyl cawv (PVA) thiab hydroxypropyl methylcellulose (HPMC). tshwm sim los ntawm incompatibility. Qhov thib ob, nws yog vim lub sijhawm nplawm tsis txaus; kuj tseem muaj qhov tseeb tias qhov kev ua haujlwm thickening ntawm kev tsim cov kua nplaum tsis zoo.

Hauv kev tsim cov kua nplaum, yuav tsum siv tam sim hydroxypropyl methylcellulose (HPMC) vim tias hydroxypropyl methylcellulose (HPMC) tsuas yog tawg hauv dej yam tsis muaj kev sib cais tiag tiag. Txog 2 feeb, cov viscosity ntawm cov kua maj mam nce, tsim cov pob tshab viscous colloid.

Cov khoom kub yaj, thaum ntsib nrog dej txias, tuaj yeem tawg sai sai hauv dej kub thiab ploj hauv dej kub. Thaum qhov kub thiab txias poob rau qee qhov kub, qhov viscosity yuav maj mam tshwm kom txog thaum nws tsim cov pob tshab viscous colloid. Tus nqi pom zoo ntawm hydroxypropyl methylcellulose (HPMC) ntxiv rau cov kua nplaum yog 2-4kg.

Hydroxypropyl methylcellulose (HPMC) muaj cov tshuaj lom neeg ruaj khov, tiv thaiv kab mob, thiab cov dej tuav tau zoo hauv kev tsim cov kua nplaum, thiab tsis cuam tshuam los ntawm kev hloov pauv ntawm pH nqi. Nws tuaj yeem siv nrog viscosity xws li 100,000 S mus rau 200,000 S. Tab sis hauv kev tsim khoom, qhov viscosity siab dua, qhov zoo dua. Lub viscosity yog inversely proportional rau lub zog daim ntawv cog lus. Qhov siab dua qhov viscosity, lub zog me dua. Feem ntau, viscosity ntawm 100,000 S yog haum.