Lub luag haujlwm ntawm HPMC hauv Drymix Mortars

Hydroxypropyl methylcellulose (HPMC) yog cov khoom siv dav siv hauv cov tshuaj khib nyiab qhuav. Nws yog ib qho cellulose derivative uas yog dej-soluble thiab muaj peev xwm tsim ib yam khoom zoo li gel thaum ntxiv rau dej. Cov cuab yeej no ua rau HPMC yog ib qho zoo heev thickening thiab binding tus neeg sawv cev, uas yog vim li cas nws yog siv nyob rau hauv ntau industries xws li zaub mov, tshuaj pleev ib ce, thiab kev tsim kho.

Hauv cov tshuaj khib nyiab qhuav, HPMC yog siv los ua tus hloov kho rheology, tus neeg saib xyuas dej, thiab tus neeg sawv cev tawm. Nws muaj qhov cuam tshuam loj rau qhov zoo thiab kev ua haujlwm ntawm cov tshuaj khib nyiab qhuav. HPMC feem ntau yog ntxiv rau me me, feem ntau 0.1% rau 0.5% los ntawm qhov hnyav ntawm cov khoom siv cementitious hauv cov tshuaj khib nyiab qhuav.

Ib qho ntawm cov haujlwm tseem ceeb ntawm HPMC hauv cov tshuaj khib nyiab qhuav yog txhawm rau txhim kho kev ua haujlwm ntawm cov mortar. Nws ua raws li kev hloov kho rheology los ntawm kev ua kom cov viscosity ntawm qhov sib tov, ua kom yooj yim rau kev ua haujlwm nrog. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog rau cov khoom siv khib nyiab uas siv rau cov ntaub ntawv tiling lossis flooring, qhov uas qhov sib xws ntawm cov mortar yog qhov tseem ceeb rau kev txhim kho kom zoo.

Lwm txoj haujlwm tseem ceeb ntawm HPMC hauv cov khoom siv khib nyiab yog nws lub peev xwm khaws dej. Thaum sib xyaw nrog dej, HPMC tsim cov khoom zoo li gel uas tso cov dej molecules hauv nws cov qauv. Cov cuab yeej no pab ua kom cov tshuaj khib nyiab ntub dej, uas yog qhov tseem ceeb rau kev kho kom zoo thiab kev teeb tsa ntawm cov tshuaj khib. Nws kuj tseem pab txo qis shrinkage thiab tawg ntawm cov tshuaj khib.

HPMC kuj ua raws li tus neeg sawv cev dispersing nyob rau hauv drymix mortars. Nws pab txhawm rau tawg pawg ntawm cov khoom, ua kom yooj yim rau lawv sib tov sib npaug thoob plaws hauv lub mortar. Cov cuab yeej no tseem ceeb tshwj xeeb tshaj yog rau cov khoom siv khib nyiab uas muaj ntau yam khoom, xws li xuab zeb, cement, thiab ntau yam khoom ntxiv.

Ntxiv nrog rau cov haujlwm tseem ceeb no, HPMC kuj tseem tuaj yeem muab lwm cov txiaj ntsig rau cov tshuaj khib nyiab qhuav. Piv txwv li, nws tuaj yeem txhim kho qhov adhesion ntawm mortar rau lub substrate, uas yog ib qho tseem ceeb rau kev siv xws li pobzeb installation. Nws tseem tuaj yeem txhim kho qhov yooj yim ntawm cov tshuaj khib nyiab, ua rau nws tsis tshua muaj kev tawg thiab tawg hauv kev ntxhov siab.

Thaum xaiv HPMC siv rau hauv cov tshuaj khib nyiab qhuav, ntau yam yuav tsum tau xav txog. Qhov tseem ceeb tshaj plaws ntawm cov khoom no yog viscosity ntawm HPMC. Lub viscosity ntawm HPMC yuav txiav txim siab txog qib ntawm thickening thiab dej tuav uas nws muab rau lub mortar. Lwm yam tseem ceeb uas yuav tsum tau xav txog suav nrog pH ntawm HPMC, nws qhov kev hloov pauv (DS), thiab nws qhov loj me.

Lub pH ntawm HPMC yog qhov tseem ceeb vim tias nws tuaj yeem cuam tshuam rau lub sijhawm teeb tsa ntawm lub mortar. Yog tias pH siab dhau lossis qis dhau, nws tuaj yeem cuam tshuam rau cov tshuaj lom neeg cov tshuaj tiv thaiv uas tshwm sim thaum lub sijhawm kho, ua rau muaj teeb meem xws li txo lub zog los yog nce shrinkage.

DS ntawm HPMC yog ib qho kev ntsuas ntawm ntau npaum li cas hydroxypropyl thiab methyl pawg txuas mus rau lub pob txha cellulose. DS siab dua txhais tau hais tias muaj ntau pawg hydroxypropyl thiab methyl, uas ua rau muaj dej-soluble ntau dua thiab khov HPMC. DS qis dua txhais tau hais tias muaj tsawg dua hydroxypropyl thiab methyl pawg, uas ua rau muaj dej-soluble tsawg thiab tsawg dua HPMC.

Qhov loj me me ntawm HPMC tuaj yeem cuam tshuam nws qhov kev ua tau zoo hauv cov tshuaj khib nyiab qhuav. Qhov loj me me tuaj yeem ua rau qhov tsis sib xws ntawm HPMC thoob plaws hauv lub mortar, thaum cov khoom me me tuaj yeem ua rau clumping thiab agglomeration ntawm HPMC.

Hauv kev xaus, HPMC yog ib qho tseem ceeb additive nyob rau hauv drymix mortars. Nws muab ntau yam txiaj ntsig, suav nrog kev txhim kho kev ua haujlwm, kev tuav dej, thiab kev tawg ntawm cov khoom.