Cov nyhuv ntawm cellulose ether ua rau tuab

Cellulose etherNws muab cov mortar ntub dej uas muaj viscosity zoo heev, tuaj yeem ua rau muaj peev xwm sib txuas ntawm cov mortar ntub dej thiab cov nyom, txhim kho kev ua haujlwm tiv thaiv kev poob qis ntawm mortar, siv dav hauv plaster mortar, lub kaw lus rwb thaiv tsev sab nraud thiab cov mortar sib txuas cib. Qhov cuam tshuam ntawm cellulose ether kuj tseem tuaj yeem ua rau muaj kev sib npaug thiab kev tiv thaiv kev tawg ntawm cov ntaub ntawv cement tshiab, los tiv thaiv kev faib ua pawg, kev sib cais thiab kev los ntshav ntawm mortar thiab concrete, tuaj yeem siv rau hauv fiber concrete, underwater concrete thiab self-compacting concrete.

Cellulose etherUa kom cov viscosity ntawm cov khoom siv cement nce ntxiv los ntawm viscosity ntawm cov kua cellulose ether. Feem ntau siv "viscosity" cov metric no los ntsuas viscosity ntawm cov kua cellulose ether, viscosity ntawm cellulose ether feem ntau yog hais txog qee qhov concentration (2%) ntawm cov kua cellulose ether, kub (20 ℃) ​​thiab shear rate (lossis tig ceev, xws li 20 RPM) tej yam kev mob, nrog rau cov kev cai ntawm cov cuab yeej ntsuas, xws li rotating viscometer ntsuas viscosity nqi. Viscosity yog ib qho tseem ceeb ntawm kev ntsuam xyuas kev ua tau zoo ntawm cellulose ether thiab cellulose ether, qhov siab dua qhov viscosity ntawm cov kua, qhov zoo dua qhov viscosity ntawm cov khoom siv cement, qhov viscosity ntawm cov khoom siv hauv paus tuaj yeem, sag tsis kam thiab tiv taus rau qhov muaj zog dua qhov muaj peev xwm dispersion, tab sis yog tias viscosity loj dhau, tuaj yeem cuam tshuam rau cov khoom siv cement hauv paus mobility thiab maneuverability (xws li kev tsim kho ntawm plaster mortar nplaum plaster). Yog li ntawd, qhov viscosity ntawm cellulose ether siv hauv cov mortar qhuav-mixed feem ntau yog 15,000 ~ 60,000 Mpa. s-1, thiab qhov viscosity ntawm cellulose ether yuav tsum qis dua rau cov mortar uas ua rau nws tus kheej thiab cov pob zeb uas muaj cov dej ntau dua. Tsis tas li ntawd, qhov thickening effect ntawm cellulose ether yuav ua rau cov dej xav tau ntawm cov khoom siv cement ntau ntxiv, yog li ua rau cov mortar ntau ntxiv. Qhov viscosity ntawm cov kua cellulose ether nyob ntawm qhov hnyav molecular (lossis qib polymerization) thiab concentration ntawm cellulose ether, qhov kub ntawm cov kua, shear rate, thiab txoj kev sim. Qhov siab dua qhov polymerization degree ntawm cellulose ether, qhov hnyav molecular ntau dua, qhov viscosity ntawm nws cov kua aqueous siab dua; Qhov ntau dua qhov koob tshuaj (lossis concentration) ntawm cellulose ether, qhov ntau dua qhov viscosity ntawm nws cov kua aqueous, tab sis thaum siv yuav tsum tau them sai sai rau kev xaiv cov koob tshuaj kom tsim nyog, kom tsis txhob sib tov ntau dhau, cuam tshuam rau kev ua haujlwm ntawm mortar thiab pob zeb; Zoo li feem ntau cov kua, qhov viscosity ntawm cellulose ether kua yuav txo qis nrog qhov nce ntawm qhov kub, thiab qhov siab dua qhov concentration ntawm cellulose ether, qhov ntau dua qhov cuam tshuam ntawm qhov kub; Cellulose ether kua feem ntau yog lub cev pseudoplastic nrog cov khoom ntawm shear thinning. Qhov siab dua ntawm qhov shear rate, qhov qis dua qhov viscosity.

Yog li ntawd, qhov sib koom ua ke ntawm cov mortar yuav raug txo los ntawm lub zog sab nraud, uas yog qhov zoo rau kev tsim cov mortar, ua rau cov mortar tuaj yeem ua haujlwm tau zoo thiab sib koom ua ke. Txawm li cas los xij, cov kua cellulose ether yuav qhia txog cov yam ntxwv ntawm Newtonian kua thaum qhov concentration qis heev thiab qhov viscosity me heev. Thaum qhov concentration nce, cov kua maj mam nthuav tawm cov yam ntxwv ntawm cov kua pseudoplastic, thiab qhov concentration siab dua, qhov pom tseeb dua ntawm pseudoplastic.