Tom qab ntxiv hydroxypropyl methylcellulose rau cov khoom siv cement, nws tuaj yeem ua kom tuab. Tus nqi ntawm hydroxypropyl methylcellulose txiav txim siab cov dej xav tau ntawm cov khoom siv cement, yog li nws yuav cuam tshuam rau cov khoom siv tshuaj khib nyiab.
Ntau yam cuam tshuam rau viscosity ntawm hydroxypropyl methylcellulose:
1. Qhov siab dua ntawm cov txheej txheem ntawm polymerization ntawm cellulose ether, qhov loj dua nws qhov hnyav molecular, thiab siab dua qhov viscosity ntawm cov tshuaj aqueous;
2. Qhov siab dua qhov noj (lossis concentration) ntawm cellulose ether, qhov siab dua qhov viscosity ntawm nws cov kua aqueous. Txawm li cas los xij, nws yog ib qho tsim nyog yuav tsum tau ua tib zoo xaiv qhov tsim nyog tau txais thaum lub sij hawm thov kom tsis txhob noj ntau dhau, uas yuav cuam tshuam rau kev ua haujlwm ntawm mortar thiab pob zeb. yam ntxwv;
3. Zoo li feem ntau cov kua dej, cov viscosity ntawm cellulose ether daws yuav txo qis nrog qhov kub thiab txias, thiab qhov siab dua ntawm cov cellulose ether, qhov kub ntawm qhov kub yuav ntau dua;
4. Hydroxypropyl methylcellulose tov feem ntau yog pseudoplastic, uas muaj cov cuab yeej ntawm shear thinning. Qhov ntau dua tus nqi shear thaum lub sij hawm kuaj, qhov viscosity qis dua.
Yog li ntawd, kev sib koom ua ke ntawm mortar yuav txo qis vim yog kev quab yuam sab nraud, uas yog qhov zoo rau kev tsim kho ntawm mortar, uas ua rau muaj kev ua haujlwm zoo thiab kev sib koom ua ke ntawm mortar tib lub sijhawm.
Cov tshuaj hydroxypropyl methylcellulose yuav qhia Newtonian kua yam ntxwv thaum lub concentration tsawg heev thiab viscosity tsawg. Thaum cov concentration nce, cov tshuaj yuav maj mam qhia pseudoplastic kua yam ntxwv, thiab qhov siab dua qhov concentration, qhov pom tseeb dua pseudoplasticity.
Post lub sij hawm: Jan-28-2023