1. Cov khoom siv raw ntawm cellulose ether
Cellulose ether rau kev tsim kho yog cov polymer uas tsis yog ionic uas yaj tau hauv dej uas nws qhov chaw yog:
Cellulose (ntoo pulp los yog paj rwb linter), halogenated hydrocarbons (methane chloride, ethyl chloride los yog lwm yam halides ntev), epoxy compounds (ethylene oxide, propylene oxide, thiab lwm yam)
HPMC-Hydroxypropyl Methyl Cellulose Ether
HEC-Hydroxyethyl Cellulose Ether
HEMC-Hydroxyethyl Methyl Cellulose Ether
EHEC-Ethyl Hydroxyethyl Cellulose Ether
MC-methyl cellulose ether
2. Cov khoom ntawm cellulose ether
Cov khoom ntawm cellulose ethers nyob ntawm:
Qib polymerization DP Tus naj npawb ntawm cov chav glucose - viscosity
Cov hloov pauv thiab lawv qib ntawm kev hloov pauv, qib ntawm kev sib xws ntawm kev hloov pauv —- txiav txim siab qhov chaw thov
Qhov Loj ntawm Particle - Kev Yaj Tau
Kev kho qhov chaw (piv txwv li kev yaj qeeb) - lub sijhawm viscosity muaj feem cuam tshuam nrog tus nqi pH ntawm lub kaw lus
Kev hloov kho degree - Txhim kho qhov sag tsis kam thiab workability ntawm cellulose ether.
3. Lub luag haujlwm ntawm cellulose ether - kev khaws cia dej
Cellulose ether yog ib qho polymer saw compound uas muaj cov β-D-glucose units. Pawg hydroxyl hauv lub molecule thiab cov pa oxygen ntawm ether bond tsim ib qho hydrogen bond nrog lub molecule dej, uas nqus cov dej molecule ntawm qhov chaw ntawm lub polymer saw thiab entangles cov molecules. Hauv cov saw, nws qeeb qhov evaporation ntawm dej thiab raug nqus los ntawm lub hauv paus txheej.
Cov txiaj ntsig los ntawm cov khoom khaws cia dej ntawm cellulose ethers muab:
Tsis tas yuav ntub cov txheej hauv paus, txuag cov txheej txheem
kev tsim kho zoo
lub zog txaus
4. Lub luag haujlwm ntawm cellulose ether - thickening effect
Cellulose ether tuaj yeem ua rau kom muaj kev sib koom ua ke ntawm cov khoom ntawm gypsum-based mortar, uas yog qhov cuam tshuam rau qhov nce ntawm qhov sib xws ntawm cov mortar.
Cov txiaj ntsig tseem ceeb uas muab los ntawm kev ua kom tuab ntawm cellulose ethers yog:
Txo cov tshauv av
Ua kom lo rau lub hauv paus ntau ntxiv
Txo qhov sagging ntawm mortar
ua kom cov mortar sib npaug zos
5. Lub luag haujlwm ntawm cellulose ether - kev ua haujlwm ntawm qhov chaw
Cellulose ether muaj cov pab pawg hydrophilic (hydroxyl pab pawg, ether bonds) thiab cov pab pawg hydrophobic (methyl pab pawg, ethyl pab pawg, glucose rings) thiab yog ib qho surfactant.
(Qhov nro ntawm qhov chaw ntawm dej yog 72mN / m, surfactant yog 30mN / m, thiab cellulose ether yog HPC 42, HPMC 50, MC 56, HEC 69, CMC 71mN / m)
Cov txiaj ntsig tseem ceeb uas muab los ntawm kev ua haujlwm ntawm cov cellulose ethers yog:
Cov nyhuv ntawm huab cua nkag (kev khawb du, qhov ceev ntub qis, qhov elastic modulus qis, tiv taus khov-thaw)
Kev ntub dej (ua rau lo rau lub substrate ntau ntxiv)
6. Cov kev cai ntawm lub teeb plastering gypsum rau cellulose ether
(1). Kev khaws cia dej zoo
(2). Ua haujlwm tau zoo, tsis muaj caking
(3). Kev khawb ua ke du
(4). Muaj zog tiv thaiv kev qaug zog
(5). Qhov kub ntawm cov gel siab dua 75 ° C
(6). Kev yaj sai
(7). Nws yog qhov zoo tshaj plaws kom muaj peev xwm nkag mus rau hauv huab cua thiab ua kom cov pa npuas hauv cov mortar ruaj khov.
11. Yuav ua li cas txiav txim siab qhov ntau npaum li cas ntawm cellulose ether
Rau cov plastering plasters, nws yog ib qho tsim nyog kom khaws cov dej txaus hauv cov mortar ntev ntev kom muaj kev ua haujlwm zoo thiab kom tsis txhob muaj qhov tawg ntawm qhov chaw. Tib lub sijhawm, cellulose ether khaws cov dej kom txaus rau lub sijhawm ntev kom ua rau cov mortar muaj cov txheej txheem coagulation ruaj khov.
Tus nqi ntawm cellulose ether nyob ntawm:
Viscosity ntawm cellulose ether
Cov txheej txheem tsim khoom ntawm cellulose ether
Cov Ntsiab Lus Hloov Chaw thiab Kev Faib Tawm ntawm Cellulose Ether
Kev Faib Tawm Qhov Loj ntawm Cellulose Ether
Hom thiab cov qauv ntawm gypsum mortar
Lub peev xwm nqus dej ntawm cov txheej hauv paus
Kev Siv Dej Rau Kev Sib Kis Txheem ntawm Gypsum-Based Mortar
Lub sijhawm teeb tsa ntawm gypsum-based mortar
Kev tsim kho tuab thiab kev ua tau zoo ntawm kev tsim kho
Cov xwm txheej ntawm kev tsim kho (xws li qhov kub thiab txias, cua ceev, thiab lwm yam)
Txoj kev tsim kho (siv tes khawb, txau tshuaj)
Lub sijhawm tshaj tawm: Lub Ib Hlis-18-2023