1. Raw khoom ntawm cellulose ether
Cellulose ether rau kev tsim kho yog non-ionic dej-soluble polymer uas nws qhov chaw yog:
Cellulose (ntoo pulp lossis 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:
Polymerization degree DP Tus naj npawb ntawm cov piam thaj - viscosity
Cov neeg hloov pauv thiab lawv qhov kev hloov pauv, qib ntawm kev hloov pauv hloov pauv -- txiav txim siab daim ntawv thov teb
Particle Loj--Solubility
Kev kho deg (piv txwv li ncua kev sib cais) - lub sijhawm viscosity cuam tshuam nrog pH tus nqi ntawm qhov system
Kev hloov kho qib--Txhim kho lub sag kuj thiab kev ua haujlwm ntawm cellulose ether.
3. Lub luag haujlwm ntawm cellulose ether - dej tuav
Cellulose ether yog ib qho khoom siv polymer sib txuas ua ke ntawm β-D-glucose units. Cov pab pawg hydroxyl nyob rau hauv cov molecule thiab cov pa atom ntawm ether daim ntawv cog lus tsim ib daim ntawv cog lus hydrogen nrog cov dej molecule, uas adsorbs dej molecule nyob rau saum npoo ntawm cov polymer saw thiab entangles lub molecules. Nyob rau hauv cov saw, nws ncua lub evaporation ntawm dej thiab yog absorbed los ntawm lub hauv paus txheej.
Cov txiaj ntsig tau muab los ntawm cov dej tuav cov khoom ntawm cellulose ethers:
Tsis tas yuav ntub lub hauv paus txheej, txuag txheej txheem
kev tsim kho zoo
muaj zog txaus
4. Lub luag hauj lwm ntawm cellulose ether - thickening nyhuv
Cellulose ether tuaj yeem ua rau kom muaj kev sib koom ua ke ntawm cov khoom ntawm gypsum-raws li mortar, uas yog tshwm sim los ntawm qhov nce ntawm qhov sib xws ntawm mortar.
Cov txiaj ntsig tseem ceeb muab los ntawm kev ua kom tuab ntawm cellulose ethers yog:
Txo cov av tshauv
Nce adhesion rau hauv paus
Txo cov sagging ntawm mortar
khaws lub mortar txawm
5. Lub luag haujlwm ntawm cellulose ether - kev ua haujlwm saum npoo
Cellulose ether muaj pawg hydrophilic (hydroxyl pawg, ether bonds) thiab hydrophobic pawg (methyl pawg, ethyl pawg, qabzib rings) thiab yog ib qho surfactant.
(Qhov nro 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 muab los ntawm kev ua haujlwm saum npoo ntawm cellulose ethers yog:
Huab cua-entraining nyhuv (nqus scraping, tsis ntub ntub, tsis muaj elastic modulus, khov-thaw kuj)
Wetting (nce adhesion rau substrate)
6. Kev xav tau ntawm lub teeb plastering gypsum rau cellulose ether
(1). Kev tuav dej zoo
(2). Kev ua haujlwm tau zoo, tsis muaj caking
(3). Batch scraping smooth
(4). Muaj zog anti-sagging
(5). Lub gel kub yog siab tshaj 75 ° C
(6). Kev tawg sai sai
(7). Nws yog qhov zoo tshaj plaws kom muaj peev xwm nkag mus rau huab cua thiab stabilize cov huab cua npuas hauv cov mortar.
11. Yuav txiav txim siab npaum li cas ntawm cellulose ether
Rau plastering plasters, nws yog ib qho tsim nyog yuav tsum khaws cov dej txaus nyob rau hauv lub mortar nyob rau lub sij hawm ntev kom muaj kev ua haujlwm zoo thiab kom tsis txhob muaj qhov tawg. Nyob rau tib lub sijhawm, cellulose ether khaws cov dej tsim nyog rau lub sijhawm ntev los ua kom cov mortar muaj txheej txheem coagulation ruaj khov.
Tus nqi ntawm cellulose ether nyob ntawm:
Viscosity ntawm cellulose ether
Kev tsim cov txheej txheem ntawm cellulose ether
Cov ntsiab lus hloov pauv thiab kev faib tawm ntawm Cellulose Ether
Particle Size Distribution of Cellulose Ether
Hom thiab muaj pes tsawg leeg ntawm gypsum-raws li mortar
Lub peev xwm nqus dej ntawm lub hauv paus txheej
Kev siv dej rau Standard Diffusion ntawm Gypsum-Based Mortar
Teem sijhawm ntawm gypsum-based mortar
Kev tsim kho thickness thiab kev tsim kho kev ua haujlwm
Kev tsim kho tej yam kev mob (xws li kub, cua ceev, thiab lwm yam)
Txoj kev tsim kho (kev tuav scraping, mechanical spraying)
Post lub sij hawm: Jan-18-2023