Dab tsi yuav cuam tshuam rau viscosity ntawm hydroxypropyl methylcellulose?

Rau daim ntawv thov ntawm cov khib nyiab ntub dej, hydroxypropyl methylcellulose muaj cov khoom tuab zoo, tuaj yeem ua kom muaj peev xwm sib txuas ntawm cov khib nyiab ntub thiab cov txheej txheej, thiab tuaj yeem txhim kho cov kev ua haujlwm ntawm cov tshuaj khib nyiab, yog li nws tau siv dav hauv plastering mortar, sab nraud. phab ntsa rwb thaiv tsev system thiab cib bonding mortar.

Rau cov nyhuv thickening ntawm cellulose ether, nws tseem tuaj yeem ua rau kom homogeneity thiab anti-dispersion muaj peev xwm ntawm cov khoom siv cement-based tshiab, thiab tseem tuaj yeem tiv thaiv cov teeb meem ntawm delamination, sib cais thiab los ntshav hauv mortar thiab pob zeb. Nws tuaj yeem siv rau Fiber-reinforced qhob, underwater pob zeb thiab nws tus kheej-compacting pob zeb.

Hydroxypropyl methylcellulose tuaj yeem ua kom cov kua nplaum ua haujlwm ntawm cov khoom siv cement. Qhov kev ua tau zoo no feem ntau yog los ntawm viscosity ntawm cellulose ether kua. Feem ntau, cov lej ntsuas ntawm viscosity yog siv los txiav txim qhov viscosity ntawm cellulose ether kua, thaum cellulose Lub viscosity ntawm ether feem ntau yog hais txog qee qhov concentration ntawm cellulose ether kua, feem ntau yog 2%, ntawm qhov ntsuas kub, xws li 20 degrees thiab tus nqi sib hloov, siv lub ntsuas ntsuas ntsuas, xws li kev sib hloov viscometer. Tus nqi viscosity.

Viscosity yog ib qho tseem ceeb ntawm kev ntsuas kev ua haujlwm ntawm cellulose ether. Qhov siab dua qhov viscosity ntawm hydroxypropyl methylcellulose tov, qhov zoo dua qhov viscosity ntawm cement-based cov ntaub ntawv, thiab qhov zoo dua qhov adhesion kev ua tau zoo rau lub substrate. Nyob rau tib lub sijhawm, nws muaj peev xwm los tiv thaiv sagging thiab muaj peev xwm tiv thaiv kev tawg yog muaj zog dua, tab sis yog tias nws cov viscosity siab dhau lawm, nws yuav cuam tshuam rau kev khiav hauj lwm thiab kev ua haujlwm ntawm cov khoom siv cement.

Dab tsi yuav cuam tshuam rau viscosity ntawm hydroxypropyl methylcellulose? Feem ntau nyob ntawm cov laj thawj hauv qab no.

1. Qhov siab dua ntawm polymerization ntawm cellulose ether ntawm hydroxypropyl methylcellulose, qhov loj dua nws qhov hnyav molecular, ua rau ntau dua viscosity ntawm nws cov kua aqueous.

2. Yog hais tias tus nqi los yog concentration ntawm cellulose ether yog siab dua, lub viscosity ntawm nws cov kua aqueous yuav siab dua. Txawm li cas los xij, kev saib xyuas yuav tsum tau coj los xaiv qhov tsim nyog ntawm cellulose ether thaum siv nws, feem ntau kom tsis txhob muaj cov cellulose ether ntau dhau. Nws yuav cuam tshuam rau kev ua haujlwm ntawm mortar thiab pob zeb.

3. Zoo li feem ntau cov kua dej, qhov viscosity ntawm cellulose ether tov yuav txo nrog qhov kub thiab txias, thiab qhov siab dua ntawm cellulose ether, qhov kub thiab txias. Qhov cuam tshuam ntau dua.

4. Cellulose ether kua feem ntau yog pseudoplastic, uas muaj cov yam ntxwv ntawm shear thinning. Qhov ntau dua qhov shear npaum li cas thaum lub sij hawm xeem, qhov me me qhov viscosity.

Lub cohesiveness ntawm mortar yuav raug txo vim qhov kev txiav txim ntawm sab nraud quab yuam, uas yog tseem conducive rau lub scraping tsim ntawm mortar, ua rau zoo cohesiveness thiab workability ntawm mortar tib lub sij hawm. Txawm li cas los xij, yog tias cov tshuaj cellulose ether muaj ntau dua concentration Thaum cov viscosity tsawg thiab cov viscosity tsawg, nws yuav qhia cov yam ntxwv ntawm Newtonian kua. Thaum cov concentration nce, cov tshuaj yuav maj mam qhia cov yam ntxwv ntawm pseudoplastic kua, thiab yog hais tias cov concentration siab dua, cov pseudoplasticity yuav pom tseeb dua.