Kev siv Cellulose Ether

Nyob rau hauv muaj pes tsawg leeg ntawm qhuav hmoov mortar,cellulose etheryog ib qho tseem ceeb additive nrog ib tug kuj tsawg tus nqi ntxiv, tab sis nws muaj peev xwm 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 ces etherifying nrog ib tug etherifying tus neeg sawv cev.

Hom cellulose ethers

A. Hydroxypropyl methyl cellulose (HPMC), uas yog tsuas yog ua los ntawm high-purity refined paj rwb li raw khoom, tshwj xeeb tshaj yog etherified nyob rau hauv alkaline tej yam kev mob.
B. Hydroxyethyl methylcellulose (HEMC), uas tsis yog-ionic cellulose ether, yog hmoov dawb nyob rau hauv tsos, tsw thiab saj tsis qab.
C. Hydroxyethyl cellulose (HEC), uas tsis yog-ionic surfactant, dawb nyob rau hauv tsos, tsis muaj ntxhiab, tasteless 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 tseem ceeb thiab Shuangfei hmoov raws li cov muab tub lim siv CMC ua cov thickener. Txawm li cas los xij, vim tias cov khoom no yog cov kab mob mildew thiab tsis tiv taus dej, 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 cov dej tuav ua haujlwm tuaj yeem tiv thaiv lub substrate los ntawm nqus dej ntau dhau 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 hauv lub hauv paus nto, qhov qhuav thiab ntxeem tau substrate yuav sai sai nqus dej ntau ntawm cov slurry, thiab cov cement slurry txheej ze rau lub hauv paus txheej yuav yooj yim plam cov dej xav tau rau hydration. , yog li tsis tsuas yog tsis tuaj yeem tsim cov cement gel nrog lub zog sib txuas ntawm qhov chaw ntawm lub substrate, tab sis nws tseem ua rau muaj kev sib hloov thiab dej seepage, kom cov cement slurry txheej yog yooj yim los 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, dej feem ntau yog siv los ntub cov substrate ua ntej, tab sis qhov kev ua hauj lwm no tsis yog tsuas yog siv zog thiab siv sij hawm, tab sis kuj lub lag luam zoo yog 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, qee zaum nws yog siv los ua coagulant.

Nrog rau txoj kev loj hlob ntawm qhuav-siv mortar,cellulose ethertau dhau los ua ib qho tseem ceeb ntawm cov cement mortar admixture. Txawm li cas los xij, muaj ntau ntau yam thiab specifications ntawm cellulose ether, thiab qhov zoo ntawm batches tseem fluctuates.