Ungakhetha kanjani i-hydroxypropyl methylcellulose yodaka lwe-plaster?

Ivelu ye-pH evamile yemikhiqizo ye-gypsum ine-acidic noma ingathathi hlangothi. Manje kunezinhlobo ezimbili zebanga lokwakhai-hydroxypropyl methylcelluloseemakethe: i-cellulose encibilika kancane ne-cellulose esheshayo (S). I-cellulose esheshayo ayifanelekile kumasistimu e-gypsum. Imikhiqizo, i-solubility impofu kakhulu ngaphansi kwezimo ezine-acidic noma ezingathathi hlangothi, futhi i-hydroxypropyl methylcellulose encibilika kancane ingancibilika emikhiqizweni ye-gypsum, kodwa i-cellulose encibilika kancane inomonakalo omkhulu, kulula ukuyihlanganisa (uma i-gypsum Ngemva kokuba udaka lunyakaziswa. udonga isikhathi esifushane, amachashazi amancane ayimbudumbudu avame ukuvela phezulu). Njengamanje, emikhiqizweni ye-gypsum, ikakhulukazi ku-gypsum mortar efafazwe ngomshini, kuyadingeka ukuthi i-cellulose ether ingahlakazwa ngokugcwele futhi incibilike ngesikhathi esifushane kakhulu, okudinga ukuthi senze ucwaningo olujulile mayelana ne-cellulose ether encibilika kancane. inqubo yokukhiqiza. Ukwelashwa kwendawo (hhayi lokho okubizwa ngokuthi ukwengezwa kwezinye izithasiselo ebangeni elijwayelekile le-cellulose ether), ukuze uvumelane nesistimu yodaka lwe-gypsum. I-Hydroxypropyl methylcellulose ether enokwelashwa kwendawo ejulile ingaba nesikhathi sokuhlakazeka esizinzile kanye nezakhiwo ezinhle zemishini kudaka lwegypsum, futhi ingathuthukisa ngokuphawulekayo inqubo yokulinganisa nokuqeda udaka.

I-gypsum mortar efuthwe ngomshini ngokuvamile isebenzisa i-hydroxypropyl methylcellulose ether ephakathi kuka-20,000 no-75,000, futhi inani elingeziwe ngokuvamile liba ngu-0.2% kuya ku-0.4%. Isikhathi sokusetha se-gypsum mortar efafazwe ngomshini silawulwa cishe ihora elingu-1. Sisebenzisa i-gypsum mortar yield stress, i-plastic viscosity, i-thixotropy, i-rheology kanye nokuvumelana kwe-slurry ukuze sahlulele ukusebenza kwemikhiqizo yodaka lwe-gypsum.

Sibheka ukulawulwa kwekhwalithi yenqubo ye-desulfurization gypsum source calcining, izigcwalisi (usimende, i-aggregate enhle, i-calcium powder esindayo) kanye nezixube (zingasetshenziswa ekuhlakazeni i-latex powder, i-hydroxypropyl methyl cellulose ether, i-perlite enwetshiwe, i-gypsum retarder) ifomula yomkhiqizo ingabizi.

I-Hydroxypropyl methyl cellulose etherngoba udaka lwe-gypsum lunokuhlanzeka okuphezulu nokusebenza kahle, futhi luye lwanconywa kabanzi ngamakhasimende odaka lwe-gypsum.