Cellulose ether piv txwv

Cellulose ether piv txwv yog ib qho polymer compound ua los ntawm cellulose nrog cov qauv ether.Txhua lub nplhaib piam thaj hauv cellulose macromolecule muaj peb pawg hydroxyl, thawj pawg hydroxyl ntawm lub thib rau carbon atom, thiab cov pab pawg hydroxyl thib ob thiab thib peb carbon atoms.Cov hydrogen hauv pawg hydroxyl yog hloov los ntawm pawg hydrocarbon los tsim cellulose.Nws yog cov khoom ntawm kev hloov ntawm hydroxyl hydrogen los ntawm pawg hydrocarbon hauv cellulose polymer.Cellulose yog polyhydroxy polymer compound uas tsis yaj los yog yaj.Cellulose tuaj yeem yaj hauv dej, dilute alkali kua thiab cov kuab tshuaj organic tom qab etherification, thiab muaj cov khoom siv thermoplastic.

Cellulose ether yog lub ntsiab lus dav dav ntawm cov khoom lag luam 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 ua haujlwm sib txawv kom tau txais cov cellulose ethers sib txawv.

Raws li cov khoom ionization ntawm cov khoom siv, cov piv txwv ntawm cellulose ethers tuaj yeem muab faib ua ionic (xws li carboxymethyl cellulose) thiab tsis-ionic (xws li methyl cellulose) ob pawg.

Raws li hom kev hloov pauv, cellulose ethers piv txwv tuaj yeem muab faib ua ib qho ether (xws li methyl cellulose) thiab sib xyaw ether (xws li hydroxypropyl methyl cellulose).Raws li kev solubility, tuaj yeem muab faib ua dej soluble (xws li hydroxyethyl cellulose) thiab organic solvent solubility (xws li ethyl cellulose).Qhuav sib xyaw mortar tsuas yog siv cov dej-soluble cellulose, uas tuaj yeem muab faib ua hom nrawm nrawm thiab ncua sij hawm dissolving hom tom qab kho deg.

Admixtures ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom ntawm cov tshuaj khib nyiab qhuav thiab suav txog ntau dua 40% ntawm cov nqi khoom siv hauv cov khoom sib xyaw qhuav.Ib feem ntau ntawm cov khoom sib xyaw hauv kev lag luam hauv tsev yog muab los ntawm cov tuam txhab txawv teb chaws, thiab cov kev siv ntau npaum li cas ntawm cov khoom kuj yog muab los ntawm cov neeg muag khoom.Raws li qhov tshwm sim, tus nqi ntawm cov khoom siv tshuaj khib nyiab qhuav tseem tseem siab, thiab nws yog ib qho nyuaj rau kev nrov nrov masonry mortar thiab plastering mortar nrog ntau qhov ntau thiab dav.Cov khoom lag luam siab kawg yog tswj hwm los ntawm cov tuam txhab txawv teb chaws, cov khoom siv tshuaj khib nyiab qhuav tau txais txiaj ntsig tsawg, cov nqi pheej yig tsis zoo;Daim ntawv thov ntawm admixture tsis muaj kev tshawb fawb thiab tsom, tsis pom kev ua raws li txawv teb chaws formulations.

Dej tuav tus neeg saib xyuas yog qhov tseem ceeb admixture los txhim kho cov dej tuav kev ua haujlwm ntawm cov khoom sib xyaw qhuav thiab tseem yog ib qho tseem ceeb ntawm cov khoom siv los txiav txim siab cov khoom siv ntawm cov khoom sib xyaw qhuav.Lub luag haujlwm tseem ceeb ntawm cellulose ether yog khaws dej.

Kev ua haujlwm ntawm cellulose ether hauv mortar yog raws li hauv qab no:

(1) mortar nyob rau hauv cellulose ether yaj nyob rau hauv dej, vim hais tias lub nto active lub luag hauj lwm los xyuas kom meej cov khoom gelled zoo sib xws nyob rau hauv lub system, thiab cellulose ether raws li ib yam ntawm cov kev tiv thaiv colloid, "pob" khoom hais, thiab nyob rau hauv nws sab nrauv nto rau tsim ib txheej ntawm lubrication zaj duab xis, lub slurry system ruaj khov dua, thiab kuj txhim kho cov slurry nyob rau hauv cov txheej txheem sib tov ntawm liquidity thiab kev tsim kho ntawm daim tawv nqaij yuav cia li zoo li.

(2) Cellulose ether tov vim nws tus kheej molecular qauv yam ntxwv, kom cov dej nyob rau hauv mortar tsis yooj yim rau poob, thiab maj mam tso tawm nyob rau hauv lub sij hawm ntev, muab mortar zoo tuav thiab ua hauj lwm.