Dab tsi yog qhov cuam tshuam rau cov dej tuav ntawm cellulose ether?

Cellulose ethers, xws li methyl cellulose (MC) thiab hydroxyethyl cellulose (HEC), feem ntau yog siv los ua cov dej tuav hauv cov khoom siv xws li cement-based mortars thiab gypsum-based plasters. Cov dej tuav ntawm cellulose ethers tuaj yeem cuam tshuam los ntawm ntau yam:

1. Chemical Structure: Cov qauv tshuaj ntawm cellulose ethers cuam tshuam rau lawv cov khoom tuav dej. Piv txwv li, hydroxyethyl cellulose (HEC) feem ntau pom cov dej tuav ntau dua piv rau methyl cellulose (MC) vim muaj cov pab pawg hydroxyethyl, uas txhim kho cov dej-khi.
2. Molecular Luj: Siab dua molecular hnyav cellulose ethers yuav muaj cov dej tuav tau zoo dua vim tias lawv tsim ntau dua hydrogen bonding tes hauj lwm nrog dej molecules. Yog li ntawd, cellulose ethers uas muaj qhov hnyav dua molecular feem ntau khaws cov dej zoo dua li cov uas muaj qhov hnyav dua molecular.
3. Dosage: Tus nqi ntawm cellulose ether ntxiv rau hauv mortar lossis plaster sib tov ncaj qha cuam tshuam cov dej tuav. Kev nce qib ntawm cellulose ether feem ntau txhim kho kev tuav dej, mus txog rau qee qhov chaw uas ntxiv ntxiv yuav tsis ua kom zoo khaws cia thiab tuaj yeem cuam tshuam rau lwm yam khoom ntawm cov khoom.
4. Particle Size thiab Distribution: Qhov loj me me thiab kev faib tawm ntawm cellulose ethers tuaj yeem cuam tshuam rau lawv cov dispersibility thiab kev ua tau zoo hauv kev khaws dej. Finely hauv av cellulose ethers nrog uniform particle loj faib yuav disperse ntau tusyees nyob rau hauv qhov sib tov, ua rau txhim kho dej tuav.
5. Kub thiab av noo: Ib puag ncig tej yam kev mob, xws li kub thiab av noo, tuaj yeem cuam tshuam rau hydration thiab dej tuav ntawm cellulose ethers. Kev kub siab dua tuaj yeem ua kom cov txheej txheem hydration, ua rau kom nqus dej sai dua thiab tuaj yeem txo cov dej tuav. Hloov chaw, cov av noo tsawg tuaj yeem txhawb nqa evaporation thiab txo cov dej tuav.
6. Cement Hom thiab Additives: Hom cement thiab lwm yam additives tam sim no nyob rau hauv mortar los yog plaster sib tov tuaj yeem cuam tshuam nrog cellulose ethers thiab cuam tshuam lawv cov dej tuav. Qee hom cement lossis additives tuaj yeem txhim kho lossis cuam tshuam cov dej khaws cia nyob ntawm lawv cov tshuaj sib raug zoo thiab kev cuam tshuam nrog cellulose ethers.
7. Mixing Procedure: Cov txheej txheem sib xyaw, suav nrog lub sijhawm sib xyaw, sib tov nrawm, thiab kev txiav txim ntawm cov khoom xyaw ntxiv, tuaj yeem cuam tshuam rau kev tawg thiab dej ntawm cellulose ethers hauv qhov sib tov. Kev sib xyaw kom zoo yog qhov tseem ceeb los xyuas kom meej qhov sib txawv ntawm cov cellulose ethers thiab ua kom dej tuav tau zoo.
8. Curing Conditions: Cov txheej txheem kho, xws li lub sijhawm kho thiab qhov kub thiab txias, tuaj yeem cuam tshuam cov dej thiab dej tuav ntawm cellulose ethers hauv cov khoom kho. Kev kho kom zoo yog tsim nyog los tso cai rau cov cellulose ethers kom hydrate tag nrho thiab ua rau cov dej tuav tau ntev hauv cov khoom tawv.

Los ntawm kev txiav txim siab txog cov xwm txheej no, cov kws tshaj lij kev tsim kho tuaj yeem txhim kho kev siv cellulose ethers ua cov dej khaws cia hauv cov tshuaj khib thiab plaster formulations kom ua tau raws li qhov xav tau kev ua tau zoo xws li kev ua haujlwm, adhesion, thiab durability.