Thickening nyhuv ntawm cellulose ether

Cellulose etherendows ntub mortar nrog viscosity zoo heev, tuaj yeem ua rau muaj peev xwm ua kom muaj peev xwm ntawm cov khib nyiab ntub dej thiab cov hauv paus hniav, txhim kho kev ua haujlwm ntawm cov tshuaj khib nyiab, dav siv hauv plaster mortar, sab nrauv rwb thaiv tsev thiab cib sib txuas mortar. Cov nyhuv thickening ntawm cellulose ether tuaj yeem ua rau kom muaj kev sib haum xeeb thiab muaj peev xwm tiv thaiv kev tawg ntawm cov khoom siv cement tshiab, los tiv thaiv kev sib cais, kev sib cais thiab los ntshav ntawm mortar thiab pob zeb, tuaj yeem siv rau hauv fiber ntau pob zeb, underwater pob zeb thiab nws tus kheej-compacting pob zeb.

Cellulose ethernce viscosity ntawm cement-based cov ntaub ntawv los ntawm viscosity ntawm cellulose ether kua. Feem ntau siv "viscosity" no metric los ntsuas cellulose ether kua viscosity, viscosity ntawm cellulose ether feem ntau yog hais txog ib qho concentration (2%) ntawm cellulose ether tov, kub (20 ℃) ​​thiab shear rate (los yog tig ceev, xws li 20. RPM) cov xwm txheej, nrog rau cov kev ntsuas ntsuas, xws li rotating viscometer ntsuas tus nqi viscosity. Viscosity yog qhov tseem ceeb ntawm kev ntsuas kev ua tau zoo ntawm cellulose ether thiab cellulose ether, qhov siab dua qhov viscosity ntawm cov tshuaj, qhov zoo dua qhov viscosity ntawm cov khoom siv cement, qhov viscosity ntawm cov khoom siv hauv paus tuaj yeem, sag tsis kam thiab tsis kam mus rau qhov muaj zog ntawm kev tawg, tab sis yog tias qhov viscosity loj dhau, tuaj yeem cuam tshuam rau cov cement puag cov khoom txav thiab maneuverability (xws li kev tsim kho ntawm plaster. mortar nplaum plaster). Yog li ntawd, viscosity ntawm cellulose ether siv nyob rau hauv qhuav sib tov mortar feem ntau yog 15,000 ~ 60,000 Mpa. s-1, thiab viscosity ntawm cellulose ether yuav tsum tau qis dua rau tus kheej-leveling mortar thiab nws tus kheej-compactconcrete nrog ntau dua fluidity yuav tsum tau. Tsis tas li ntawd, cov nyhuv thickening ntawm cellulose ether yuav ua rau kom cov dej xav tau ntawm cov khoom siv cement, yog li ua rau cov khoom siv khib nyiab. Lub viscosity ntawm cov tshuaj cellulose ether nyob ntawm qhov hnyav molecular (los yog degree ntawm polymerization) thiab concentration ntawm cellulose ether, tov kub, shear npaum li cas, thiab xeem txoj kev. Qhov siab dua ntawm polymerization degree ntawm cellulose ether, qhov hnyav dua molecular, qhov siab dua qhov viscosity ntawm nws cov kua aqueous; Qhov ntau npaum li cas (lossis concentration) ntawm cellulose ether, qhov siab dua qhov viscosity ntawm nws cov kua aqueous, tab sis nyob rau hauv kev siv yuav tsum tau xyuam xim rau kev xaiv ntawm cov tshuaj uas tsim nyog, thiaj li tsis mus sib tov siab dhau lawm, cuam tshuam rau kev ua tau zoo ntawm mortar thiab pob zeb; Zoo li feem ntau cov kua dej, cov viscosity ntawm cellulose ether tov yuav txo nrog qhov kub thiab txias, thiab siab dua qhov concentration ntawm cellulose ether, cov nyhuv ntawm qhov kub thiab txias ntau dua; Cellulose ether kua feem ntau yog lub cev pseudoplastic nrog cov cuab yeej ntawm shear thinning. Qhov siab dua tus nqi shear, qhov viscosity qis dua.

Yog li ntawd, lub cohesion ntawm mortar yuav raug txo los ntawm sab nraud quab yuam, uas yog conducive rau lub scraping siv ntawm mortar, ua mortar muaj peev xwm ua hauj lwm zoo thiab cohesion. Txawm li cas los xij, cov tshuaj cellulose ether yuav qhia cov yam ntxwv ntawm Newtonian kua thaum lub concentration tsawg heev thiab cov viscosity tsawg heev. Thaum cov concentration nce, cov tshuaj maj mam nthuav tawm cov yam ntxwv ntawm cov kua dej pseudoplastic, thiab qhov siab dua qhov concentration, qhov pom tseeb dua pseudoplastic.