Piv txwv li cellulose ether

Cellulose etherPiv txwv li yog ib qho polymer compound ua los ntawm cellulose nrog ib qho ether qauv. Txhua lub nplhaib glucose hauv cellulose macromolecule muaj peb pawg hydroxyl, pawg hydroxyl thawj zaug ntawm lub atom carbon thib rau, thiab pawg hydroxyl thib ob ntawm lub atom carbon thib ob thiab thib peb. Cov hydrogen hauv pawg hydroxyl raug hloov los ntawm pawg hydrocarbon los tsim cellulose. Nws yog cov khoom ntawm kev hloov pauv ntawm hydroxyl hydrogen los ntawm pawg hydrocarbon hauv cellulose polymer. Cellulose yog ib qho polyhydroxy polymer compound uas tsis yaj lossis yaj. Cellulose tuaj yeem yaj hauv dej, dilute alkali kua thiab organic solvent tom qab etherification, thiab muaj cov khoom thermoplastic.

Cellulose ether yog lub ntsiab lus dav dav ntawm cov khoom tsim los ntawm cov tshuaj tiv thaiv ntawm alkali cellulose thiab etherifying tus neeg sawv cev nyob rau hauv qee qhov xwm txheej. Alkali cellulose yog hloov los ntawm cov neeg sawv cev etherifying sib txawv kom tau txais cov cellulose ethers sib txawv.

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

Raws li hom kev hloov pauv,cov cellulose ethersPiv txwv li, muaj peev xwm muab faib ua ib qho ether (xws li methyl cellulose) thiab sib xyaw ether (xws li hydroxypropyl methyl cellulose). Raws li kev yaj, muaj peev xwm muab faib ua dej yaj (xws li hydroxyethyl cellulose) thiab cov organic solvent solubility (xws li ethyl cellulose). Cov mortar qhuav feem ntau siv cov cellulose yaj hauv dej, uas muaj peev xwm muab faib ua hom yaj sai thiab hom yaj qeeb tom qab kho qhov chaw.

Cov tshuaj ntxiv ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov yam ntxwv ntawm cov tshuaj qhuav sib xyaw thiab suav txog ntau dua 40% ntawm cov nqi khoom siv hauv cov tshuaj qhuav sib xyaw. Ib feem loj ntawm cov tshuaj ntxiv hauv kev lag luam hauv tsev yog muab los ntawm cov chaw tsim khoom txawv teb chaws, thiab cov koob tshuaj siv rau cov khoom kuj yog muab los ntawm cov neeg muag khoom. Yog li ntawd, tus nqi ntawm cov khoom siv qhuav sib xyaw tseem siab, thiab nws nyuaj rau kev ua kom nrov npe ntawm cov tshuaj masonry thiab cov tshuaj plastering nrog ntau thiab thaj chaw dav. Cov khoom lag luam siab kawg raug tswj hwm los ntawm cov tuam txhab txawv teb chaws, cov chaw tsim khoom siv qhuav tsis muaj txiaj ntsig, tus nqi tsis zoo; Kev siv cov tshuaj ntxiv tsis muaj kev tshawb fawb thiab tsom mus rau, ua raws li cov qauv txawv teb chaws.

Tus neeg sawv cev khaws dej yog qhov tseem ceeb ntawm cov khoom sib xyaw kom txhim kho kev ua tau zoo ntawm cov xuab zeb sib xyaw qhuav thiab kuj yog ib qho ntawm cov khoom sib xyaw tseem ceeb los txiav txim siab tus nqi khoom siv ntawm cov xuab zeb sib xyaw qhuav. Lub luag haujlwm tseem ceeb ntawm cellulose ether yog khaws dej.

Lub tshuab ua haujlwm ntawm cellulose ether hauv mortar yog raws li nram no:

(1) mortar hauv cellulose ether yaj hauv dej, vim tias qhov chaw ua haujlwm ua lub luag haujlwm los xyuas kom meej tias cov khoom siv gelled zoo sib xws hauv lub kaw lus, thiab cellulose ether ua ib hom colloid tiv thaiv, "pob" cov khoom khov, thiab ntawm nws sab nraud los tsim ib txheej ntawm zaj duab xis lubrication, lub kaw lus slurry ruaj khov dua, thiab tseem txhim kho cov slurry hauv cov txheej txheem sib tov ntawm cov kua thiab kev tsim kho ntawm qhov swb kuj zoo ib yam.

(2)Cellulose etherkev daws teeb meem vim nws cov yam ntxwv ntawm cov qauv molecular, yog li cov dej hauv mortar tsis yooj yim poob, thiab maj mam tso tawm hauv lub sijhawm ntev dua, muab mortar khaws dej zoo thiab ua haujlwm tau zoo.