Nyob rau hauv muaj pes tsawg leeg ntawm qhuav hmoov mortar, methyl cellulose yog ib tug kuj tsis tshua muaj nqi ntxiv, tab sis nws muaj ib tug tseem ceeb additive uas yuav ho txhim kho qhov sib tov thiab kev tsim kho ntawm mortar.Txhawm rau muab nws yooj yim, yuav luag txhua qhov sib xyaw ntub dej ntawm cov tshuaj khib nyiab uas tuaj yeem pom ntawm qhov muag liab qab yog muab los ntawm cellulose ether.Nws yog cellulose derivative tau los ntawm kev siv cellulose los ntawm ntoo thiab paj rwb, reacting nrog caustic soda, thiab etherifying nws nrog ib tug etherifying tus neeg sawv cev.
Hom Methyl Cellulose Ether
A.Hydroxypropyl methylcellulose (HPMC) feem ntau yog ua los ntawm cov paj rwb ntshiab heev refined li raw khoom, uas yog tshwj xeeb etherified nyob rau hauv alkaline tej yam kev mob.
B.Hydroxyethyl methyl cellulose (HEMC), uas tsis yog-ionic cellulose ether, yog cov hmoov dawb, tsis muaj ntxhiab thiab tsis qab.
C.Hydroxyethylcellulose (HEC) yog ib qho uas tsis yog-ionic surfactant, dawb nyob rau hauv tsos, tsis muaj ntxhiab thiab saj tsis qab thiab yooj yim-flowing hmoov.
Cov saum toj no yog non-ionic cellulose ethers, thiab ionic cellulose ethers (xws li carboxymethyl cellulose (CMC)).
Thaum siv cov hmoov qhuav mortar, vim tias ionic cellulose (CMC) tsis ruaj khov nyob rau hauv lub xub ntiag ntawm calcium ions, nws tsis tshua muaj siv nyob rau hauv inorganic gelling systems nrog xis mas thiab slaked txiv qaub li cementing cov ntaub ntawv.Hauv qee qhov chaw hauv Suav teb, Qee cov phab ntsa sab hauv tau ua tiav nrog cov hmoov txhuv nplej siab hloov ua cov khoom siv cementing thiab Shuangfei hmoov raws li cov muab tub lim siv CMC ua cov thickener, tab sis vim tias cov khoom no yog cov kab mob mildew thiab tsis muaj dej-resistant, nws maj mam tshem tawm. los ntawm kev ua lag luam.Tam sim no, cellulose ether feem ntau siv hauv Suav teb yog HPMC.
Cellulose ether feem ntau yog siv los ua tus neeg saib xyuas dej thiab cov thickener hauv cov khoom siv cement.
Nws txoj haujlwm tuav dej tuaj yeem tiv thaiv lub substrate los ntawm kev nqus dej ntau dhau sai thiab cuam tshuam cov evaporation ntawm cov dej, thiaj li xyuas kom meej tias cov cement muaj dej txaus thaum nws hydrated.Siv cov txheej txheem plastering ua piv txwv.Thaum cov cement slurry zoo tib yam siv rau ntawm qhov chaw ntawm lub substrate, qhov qhuav thiab ntxeem tau substrate yuav sai sai nqus dej ntau los ntawm slurry, thiab cov cement slurry txheej ze rau lub substrate yuav yooj yim poob nws hydration.Yog li ntawd, tsis tsuas yog tsis tuaj yeem tsim cov cement gel nrog lub zog nplaum rau ntawm qhov chaw ntawm lub substrate, tab sis kuj yooj yim ua rau warping thiab dej seepage, kom cov cement slurry txheej yog yooj yim poob.Thaum cov grout thov yog nyias, nws kuj yog ib qho yooj yim los tsim cov kab nrib pleb hauv tag nrho cov grout.Yog li ntawd, nyob rau hauv lub yav dhau los nto plastering ua hauj lwm, lub hauv paus cov ntaub ntawv yog feem ntau wetted nrog dej ua ntej, tab sis qhov kev ua hauj lwm no yog siv zog thiab siv sij hawm-siv, thiab lub lag luam zoo yog ib qho nyuaj rau tswj.
Feem ntau hais lus, cov dej tuav ntawm cov cement slurry nce nrog qhov nce ntawm cov ntsiab lus ntawm cellulose ether.Qhov ntau dua qhov viscosity ntawm ntxiv cellulose ether, qhov dej tuav tau zoo dua.
Ntxiv nrog rau cov dej tuav thiab thickening, cellulose ether tseem cuam tshuam rau lwm yam khoom ntawm cement mortar, xws li retarding, entraining huab cua, thiab ua kom muaj zog daim ntawv cog lus.Cellulose ether slows down qhov chaw thiab hardening txheej txheem ntawm cement, yog li ncua lub sij hawm ua hauj lwm, yog li ntawd nws yog siv raws li ib tug txheej txheem regulator.
Nrog rau txoj kev loj hlob ntawm qhuav-siv mortar, cellulose ether tau dhau los ua ib qho tseem ceeb cement mortar admixture.Txawm li cas los xij, muaj ntau ntau yam thiab specifications ntawm cellulose ether, thiab qhov zoo ntawm batches tseem fluctuates.
1. Cov yam ntxwv ua haujlwm ntawm kev hloov mortar yog ze ze rau kev txhim kho viscosity ntawm cellulose ether.Txawm hais tias cov khoom uas muaj qhov siab nominal viscosity muaj qhov siab kawg viscosity, vim tias qeeb qeeb, nws yuav siv sij hawm ntev kom tau qhov kawg viscosity;Tsis tas li ntawd, cellulose ether nrog coarser hais yuav siv sij hawm ntev kom tau qhov kawg viscosity, yog li cov khoom uas muaj viscosity siab dua tsis tas yuav muaj cov yam ntxwv ua haujlwm zoo dua.
2. Vim qhov kev txwv ntawm cov degree ntawm polymerization ntawm cellulose ether raw cov ntaub ntawv, lub siab tshaj plaws viscosity ntawm cellulose ether kuj txwv.
3. Nws yog ib qho tsim nyog los xyuas qhov kev yuav khoom, cov txheej txheem tsim khoom thiab kev tshuaj xyuas lub Hoobkas kom tsis txhob muaj kev hloov pauv zoo.
Post lub sij hawm: Feb-17-2023