Cellulose ether yog cov ntsiab lus dav dav rau cov khoom lag luam uas tsim los ntawm cov tshuaj tiv thaiv ntawm alkali cellulose thiab etherifying tus neeg sawv cev nyob rau hauv qee yam mob. Alkali cellulose yog hloov los ntawm cov neeg sawv cev sib txawv kom tau txais qhov sib txawvcellulose ethers. Raws li cov khoom ionization ntawm cov khoom hloov, cellulose ethers tuaj yeem muab faib ua ob pawg: ionic (xws li carboxymethyl cellulose) thiab non-ionic (xws li methyl cellulose). Raws li hom kev hloov pauv, cellulose ether tuaj yeem muab faib ua monoether (xws li methyl cellulose) thiab sib xyaw ether (xws li hydroxypropyl methyl cellulose). Raws li kev sib txawv solubility, nws tuaj yeem muab faib ua dej-soluble (xws li hydroxyethyl cellulose) thiab organic solvent-soluble (xws li ethyl cellulose), thiab lwm yam. Cov tshuaj khib nyiab qhuav yog dej-soluble cellulose, thiab dej-soluble cellulose yog muab faib ua hom instant thiab nto kho ncua sij hawm dissolution hom.
Tom qab cov cellulose ether nyob rau hauv lub mortar yog yaj nyob rau hauv dej, qhov zoo thiab niaj hnub faib ntawm cov cementitious cov ntaub ntawv nyob rau hauv lub system yog guaranteed vim lub nto nto, thiab cov cellulose ether, raws li ib tug tiv thaiv colloid, "wraps" cov khoom thiab npog. lawv nyob rau sab nrauv. Tsim ib zaj duab xis lubricating, ua kom lub mortar system ruaj khov, thiab tseem txhim kho cov kua dej ntawm cov mortar thaum lub sij hawm sib tov thiab smoothness ntawm kev tsim kho.
Vim nws cov qauv molecular, cov tshuaj cellulose ether ua rau cov dej hauv cov tshuaj khib nyiab tsis yooj yim ploj, thiab maj mam tso tawm rau lub sijhawm ntev, ua rau cov mortar nrog cov dej tuav tau zoo thiab ua haujlwm tau zoo.
Self-leveling av cement mortar, nrog tsawg viscosity hydroxypropyl methylcellulose ether. Txij li thaum tag nrho hauv av yog ib txwm muaj kev cuam tshuam me ntsis los ntawm kev tsim kho cov neeg ua haujlwm, piv nrog cov txheej txheem kev sib tw dhau los, qhov flatness thiab kev tsim kho ceev tau zoo heev. Tus kheej-leveling qhuav mixing lub sij hawm yuav siv sij hawm kom zoo dua ntawm cov dej zoo tuav ntawm hydroxypropyl methylcellulose. Txij li nws tus kheej-leveling yuav tsum tau kom tus sib npaug ntawm cov tshuaj khib nyiab tuaj yeem ua rau hauv av, cov khoom siv dej kuj loj heev. Tom qab ntxiv hpmc, nws yuav tswj cov av Cov dej tuav ntawm qhov chaw tsis pom tseeb, uas ua rau lub zog saum npoo siab tom qab ziab, thiab qhov shrinkage yog me me, uas txo cov kab nrib pleb. Qhov sib ntxiv ntawm HPMC kuj tseem muab cov viscosity, uas tuaj yeem siv los ua kev pab tiv thaiv sedimentation, txhim khu fluidity thiab pumpability, thiab txhim kho kev ua haujlwm ntawm paving hauv av.
Zoo cellulose ether muaj qhov muag pom lub xeev thiab qhov loj me me; Cov ntshiab HPMC muaj cov xim dawb zoo, cov khoom siv raw siv hauv kev tsim khoom yog ntshiab, cov tshuaj tiv thaiv ntau dua thiab tsis muaj impurities, cov tshuaj aqueous yog ntshiab, lub teeb kis tau siab, thiab tsis muaj ammonia, hmoov txhuv nplej siab thiab cawv. Saj, fibrous nyob rau hauv microscope los yog magnifying iav.
Post lub sij hawm: Dec-06-2022