Nyob rau hauv mortar, cellulose ether plays lub luag hauj lwm ntawm cov dej tuav, thickening, ncua cov cement hydration zog, thiab txhim kho kev tsim kho. Lub peev xwm tuav dej zoo ua rau cov cement hydration ntau dua, tuaj yeem txhim kho cov viscosity ntawm cov khib nyiab ntub dej, ua kom lub zog sib txuas ntawm mortar, thiab kho lub sijhawm. Ntxiv cellulose ether rau cov neeg kho tshuab txau mortar tuaj yeem txhim kho cov tshuaj txau lossis kev ua haujlwm thiab kev ua haujlwm ntawm cov tshuaj khib nyiab. Cellulose yog dav siv los ua ib qho tseem ceeb additive nyob rau hauv npaj-mixed mortar. Siv cov khoom siv hauv tsev ua piv txwv, cellulose ether muaj cov khoom zoo xws li thickening, dej tuav, thiab retardation. Yog li ntawd, cov khoom siv hauv tsev qib cellulose ether yog dav siv los txhim kho cov khoom sib xyaw ua ke (nrog rau cov ntaub ntub dej sib xyaw thiab cov khib nyiab qhuav sib xyaw), PVC resin, thiab lwm yam, latex xim, putty, thiab lwm yam. cov khoom siv hauv tsev.
Cellulose tuaj yeem ncua cov txheej txheem dej ntawm cov cement. Cellulose ether endows mortar nrog ntau yam khoom muaj txiaj ntsig, thiab tseem txo qis cov dej thaum ntxov ntawm cov cement thiab ncua cov txheej txheem hydration dynamic ntawm cov cement. Qhov no yog qhov tsis zoo rau kev siv tshuaj khib nyiab hauv thaj chaw txias. Cov nyhuv retardation no yog tshwm sim los ntawm adsorption ntawm cellulose ether molecules ntawm hydration khoom xws li CSH thiab ca (OH) 2. Vim qhov nce hauv qhov viscosity ntawm cov pore tov, cellulose ether txo qhov kev txav ntawm ions hauv cov tshuaj, yog li ncua cov txheej txheem hydration. Qhov siab dua qhov concentration ntawm cellulose ether nyob rau hauv cov ntxhia gel cov ntaub ntawv, ntau pronounced cov nyhuv ntawm hydration ncua. Cellulose ether tsis tsuas yog ncua kev teeb tsa, tab sis tseem ncua cov txheej txheem hardening ntawm cov cement mortar system. Cov nyhuv retarding ntawm cellulose ether nyob ntawm tsis tsuas yog nyob rau hauv nws cov concentration nyob rau hauv cov ntxhia gel system, tab sis kuj nyob rau hauv cov tshuaj. Qhov siab dua qib ntawm methylation ntawm HEMC, qhov zoo dua qhov cuam tshuam ntawm cellulose ether. Qhov piv ntawm hydrophilic hloov pauv mus rau kev hloov pauv dej nce ntxiv Cov nyhuv retarding muaj zog dua. Txawm li cas los xij, viscosity ntawm cellulose ether tsis tshua muaj txiaj ntsig rau cov cement hydration kinetics.
Nrog rau qhov nce ntawm cov ntsiab lus ntawm hydroxypropyl methylcellulose ether, lub sijhawm teem sijhawm ntawm cov tshuaj khib nyiab tau nce ntau. Muaj kev sib raug zoo tsis zoo nyob nruab nrab ntawm lub sijhawm pib ntawm mortar thiab cov ntsiab lus ntawm cellulose ether, thiab kev sib raug zoo linear ntawm lub sijhawm kawg thiab cov ntsiab lus ntawm cellulose ether. Peb tuaj yeem tswj lub sijhawm ua haujlwm ntawm cov tshuaj khib nyiab los ntawm kev hloov cov cellulose ether.
Post lub sij hawm: Mar-09-2023