Tom qab ntxiv hydroxypropyl methylcellulose rau hauv cov ntaub ntawv cement, nws tuaj yeem tuab. Qhov ntau ntawm hydroxypropyl methylcellulose txiav txim siab qhov xav tau dej ntawm cov ntaub ntawv cement, yog li nws yuav cuam tshuam rau qhov tso zis ntawm cov mortar.
Muaj ntau yam uas cuam tshuam rau qhov viscosity ntawm hydroxypropyl methylcellulose:
1. Qhov siab dua ntawm qib polymerization ntawm cellulose ether, qhov loj dua nws qhov hnyav molecular, thiab qhov siab dua qhov viscosity ntawm cov kua dej;
2. Qhov ntau dua qhov kev noj (lossis concentration) ntawm cellulose ether, qhov ntau dua qhov viscosity ntawm nws cov kua dej. Txawm li cas los xij, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau kev xaiv qhov kev noj kom raug thaum lub sijhawm thov kom tsis txhob muaj kev noj ntau dhau, uas 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 ntau dua qhov cuam tshuam ntawm qhov kub;
4. Cov kua Hydroxypropyl methylcellulose feem ntau yog pseudoplastic, uas muaj cov yam ntxwv ntawm shear thinning. Qhov ntau dua qhov shear rate thaum lub sijhawm sim, qhov qis dua qhov viscosity.
Yog li ntawd, qhov kev sib koom ua ke ntawm cov tshuaj khib yuav txo qis vim yog lub zog sab nraud, uas yog qhov zoo rau kev khawb cov tshuaj khib, ua rau muaj kev ua haujlwm zoo thiab kev sib koom ua ke ntawm cov tshuaj khib tib lub sijhawm.
Cov kua hydroxypropyl methylcellulose yuav qhia txog cov yam ntxwv ntawm Newtonian kua thaum qhov concentration qis heev thiab qhov viscosity qis. Thaum qhov concentration nce ntxiv, cov kua yuav maj mam qhia txog cov yam ntxwv ntawm cov kua pseudoplastic, thiab qhov concentration siab dua, qhov pseudoplasticity pom tseeb dua.
Lub sijhawm tshaj tawm: Lub Ib Hlis-28-2023