Rau kev siv cov mortar ntub,hydroxypropyl methylcellulosemuaj cov khoom ua kom tuab zoo, tuaj yeem ua rau muaj peev xwm sib txuas ntawm cov mortar ntub thiab txheej hauv paus, thiab tseem tuaj yeem txhim kho kev ua haujlwm tiv thaiv kev poob qis ntawm mortar, yog li nws yog siv dav hauv plastering Mortar, phab ntsa sab nraud rwb thaiv tsev thiab cib bonding mortar.
Rau qhov ua kom tuab ntawm cellulose ether, nws kuj tseem tuaj yeem ua rau kom muaj kev sib xws thiab kev tiv thaiv kev tawg ntawm cov khoom siv cement sib xyaw tshiab, thiab tseem tuaj yeem tiv thaiv cov teeb meem ntawm kev sib cais, kev sib cais thiab kev los ntshav hauv cov mortar thiab cov pob zeb ua vaj tse. Nws tuaj yeem siv rau Fiber-reinforced concrete, underwater concrete thiab self-compacting concrete.
Hydroxypropyl methylcellulose tuaj yeem ua rau kom muaj kev ua tau zoo ntawm cov khoom siv cement. Qhov kev ua tau zoo no feem ntau yog los ntawm qhov viscosity ntawm cellulose ether kua. Feem ntau, cov lej ntsuas ntawm viscosity yog siv los txiav txim siab qhov viscosity ntawm cellulose ether kua, thaum cellulose Qhov viscosity ntawm ether feem ntau yog hais txog qee qhov concentration ntawm cellulose ether kua, feem ntau yog 2%, ntawm qhov kub thiab txias tshwj xeeb, xws li 20 degrees thiab tus nqi tig, siv cov cuab yeej ntsuas tshwj xeeb, xws li lub ntsuas viscometer tig. Tus nqi viscosity.
Viscosity yog ib qho ntawm cov yam ntxwv tseem ceeb los txiav txim siab qhov kev ua tau zoo ntawm cellulose ether. Qhov siab dua qhov viscosity ntawm hydroxypropyl methylcellulose kua, qhov zoo dua qhov viscosity ntawm cov ntaub ntawv cement, thiab qhov zoo dua qhov kev ua tau zoo ntawm kev nplaum rau lub substrate. Tib lub sijhawm, nws muaj Lub peev xwm tiv thaiv kev sagging thiab kev tiv thaiv kev tawg yog muaj zog dua, tab sis yog tias nws viscosity siab dhau, nws yuav cuam tshuam rau qhov kev ua tau zoo ntawm kev ntws thiab kev ua haujlwm ntawm cov ntaub ntawv cement.
Muaj tej yam dab tsi uas yuav cuam tshuam rau qhov viscosity ntawm hydroxypropyl methylcellulose? Feem ntau nyob ntawm cov laj thawj hauv qab no.
1. Qhov siab dua ntawm qib polymerization ntawm cellulose ether ntawm hydroxypropyl methylcellulose, qhov loj dua nws qhov hnyav molecular, ua rau muaj viscosity siab dua ntawm nws cov kua dej.
2. Yog tias qhov ntau lossis qhov concentration ntawm cellulose ether siab dua, qhov viscosity ntawm nws cov kua dej yuav siab dua. Txawm li cas los xij, yuav tsum tau ceev faj xaiv qhov ntau ntawm cellulose ether thaum siv nws, feem ntau yog kom tsis txhob muaj cellulose ether ntau dhau. Nws yuav cuam tshuam rau kev ua haujlwm ntawm mortar thiab concrete.
3. Ib yam li feem ntau cov kua dej, qhov viscosity ntawm cellulose ether kua yuav txo qis nrog rau qhov nce ntawm qhov kub, thiab qhov siab dua qhov concentration ntawm cellulose ether, qhov qis dua qhov kub. Qhov ntau dua qhov cuam tshuam.
4. Cov kua cellulose ether feem ntau yog pseudoplastic, uas muaj cov yam ntxwv ntawm shear thinning. Qhov ntau dua qhov shear rate thaum lub sijhawm sim, qhov me dua qhov viscosity.
Qhov kev sib koom ua ke ntawm cov mortar yuav raug txo vim yog qhov kev ua ntawm lub zog sab nraud, uas kuj yog qhov zoo rau kev khawb cov mortar, ua rau muaj kev sib koom ua ke zoo thiab ua haujlwm tau zoo ntawm cov mortar tib lub sijhawm. Txawm li cas los xij, yog tiascellulose etherCov tshuaj muaj qhov concentration siab dua Thaum qhov viscosity qis thiab qhov viscosity me me, nws yuav qhia txog cov yam ntxwv ntawm Newtonian kua. Thaum qhov concentration nce ntxiv, cov tshuaj yuav maj mam qhia txog cov yam ntxwv ntawm pseudoplastic kua, thiab yog tias qhov concentration siab dua, qhov pseudoplasticity yuav pom tseeb dua.
Lub sijhawm tshaj tawm: Plaub Hlis-28-2024