Hauv cov tshuaj khib, cellulose ether ua lub luag haujlwm ntawm kev khaws dej, ua kom tuab, ncua lub zog ua kom cov cement noo, thiab txhim kho kev ua haujlwm ntawm kev tsim kho. Lub peev xwm khaws dej zoo ua rau cov cement noo ntau dua, tuaj yeem txhim kho qhov viscosity ntawm cov tshuaj khib ntub, ua kom lub zog sib txuas ntawm cov tshuaj khib, thiab kho lub sijhawm. Ntxiv cellulose ether rau cov tshuaj txau tshuab tuaj yeem txhim kho kev ua haujlwm txau lossis twj thiab lub zog ntawm cov tshuaj khib. Cellulose yog siv dav ua cov khoom ntxiv tseem ceeb hauv cov tshuaj khib sib xyaw ua tiav. Piv txwv li, piv txwv li, cellulose ether muaj cov khoom zoo heev xws li kev ua kom tuab, khaws dej, thiab qeeb. Yog li ntawd, cov khoom siv hauv tsev qib cellulose ether yog siv dav los txhim kho kev tsim cov tshuaj khib sib xyaw ua tiav (suav nrog cov tshuaj khib sib xyaw ntub thiab cov tshuaj khib sib xyaw qhuav), PVC resin, thiab lwm yam, xim latex, putty, thiab lwm yam, suav nrog kev ua haujlwm ntawm cov khoom siv hauv tsev.
Cellulose tuaj yeem ncua cov txheej txheem hydration ntawm cement. Cellulose ether muab ntau yam khoom zoo rau mortar, thiab tseem txo qhov kub hydration thaum ntxov ntawm cement thiab ncua cov txheej txheem hydration dynamic ntawm cement. Qhov no tsis zoo rau kev siv mortar hauv thaj chaw txias. Qhov cuam tshuam qeeb no yog tshwm sim los ntawm kev nqus ntawm cellulose ether molecules ntawm cov khoom hydration xws li CSH thiab ca (OH) 2. Vim yog qhov nce ntawm viscosity ntawm cov kua pore, cellulose ether txo qhov kev txav mus los ntawm cov ions hauv cov kua, yog li ncua cov txheej txheem hydration. Qhov siab dua qhov concentration ntawm cellulose ether hauv cov khoom siv mineral gel, qhov ntau dua qhov cuam tshuam ntawm hydration ncua. Cellulose ether tsis yog tsuas yog ncua kev teeb tsa, tab sis kuj ncua cov txheej txheem hardening ntawm lub cev cement mortar. Qhov cuam tshuam retarding ntawm cellulose ether tsis yog nyob ntawm nws qhov concentration hauv lub cev mineral gel, tab sis kuj nyob ntawm cov qauv tshuaj. Qhov siab dua qib ntawm methylation ntawm HEMC, qhov zoo dua qhov cuam tshuam retarding ntawm cellulose ether. Qhov piv ntawm hydrophilic substitution rau dej-nce substitution Qhov cuam tshuam retarding muaj zog dua. Txawm li cas los xij, qhov viscosity ntawm cellulose ether muaj me ntsis cuam tshuam rau cov cement hydration kinetics.
Nrog rau qhov nce ntawm cov ntsiab lus ntawm hydroxypropyl methylcellulose ether, lub sijhawm teeb tsa ntawm cov mortar tau nce ntxiv ntau heev. Muaj kev sib raug zoo nonlinear ntawm lub sijhawm teeb tsa thawj zaug ntawm mortar thiab cov ntsiab lus ntawm cellulose ether, thiab muaj kev sib raug zoo linear ntawm lub sijhawm teeb tsa zaum kawg thiab cov ntsiab lus ntawm cellulose ether. Peb tuaj yeem tswj lub sijhawm ua haujlwm ntawm cov mortar los ntawm kev hloov pauv ntawm cov cellulose ether.
Lub sijhawm tshaj tawm: Lub Peb Hlis-09-2023