Ungayikhetha kanjani i-hydroxypropyl methylcellulose yodaka lwe-plaster?

Inani le-pH elijwayelekile lemikhiqizo ye-gypsum liyi-acidic noma lingathathi hlangothi. Manje kunezinhlobo ezimbili zezinga lokwakhai-hydroxypropyl methylcelluloseemakethe: i-cellulose encibilika kancane kanye ne-cellulose esheshayo (S). I-cellulose esheshayo ayifaneleki ezinhlelweni ze-gypsum. Imikhiqizo, ukuncibilika kuphansi kakhulu ngaphansi kwezimo ze-acidic noma ezingathathi hlangothi, futhi i-hydroxypropyl methylcellulose encibilika kancane ingancibilika emikhiqizweni ye-gypsum, kodwa i-cellulose encibilika kancane inobuthakathaka obukhulu, kulula ukuyihlanganisa (lapho i-gypsum Ngemva kokuba udoti uvuselelwe odongeni isikhathi esifushane, amabala amancane e-granular avame ukuvela ebusweni). Njengamanje, emikhiqizweni ye-gypsum, ikakhulukazi kudoti we-gypsum ofuthwe ngomshini, kuyadingeka ukuthi i-cellulose ether ingahlakazeka ngokuphelele futhi ichitheke ngesikhathi esifushane kakhulu, okudinga ukuthi senze ucwaningo olujulile ngenqubo yokukhiqizwa kwe-cellulose ether encibilika kancane. Ukwelashwa kwendawo (hhayi okubizwa ngokuthi ukwengezwa kwezinye izithasiselo ku-cellulose ether ejwayelekile yebanga), ukuze ivumelane nohlelo lwe-gypsum mortar. I-Hydroxypropyl methylcellulose ether enokwelashwa okujulile kwendawo ingaba nesikhathi sokuncibilika esizinzile kanye nezakhiwo ezinhle zemishini kudoti we-gypsum, futhi ingathuthukisa kakhulu inqubo yokulinganisa nokuqeda udoti.

Udaka lwe-gypsum olufuthwe ngomshini ngokuvamile lusebenzisa i-hydroxypropyl methylcellulose ether ene-viscosity ephansi phakathi kuka-20,000 no-75,000, kanti inani lokwengeza ngokuvamile lingu-0.2% kuya ku-0.4%. Isikhathi sokubeka udaka lwe-gypsum olufuthwe ngomshini silawulwa cishe ihora eli-1. Sisebenzisa ukucindezeleka kwe-gypsum mortar yield, i-plastic viscosity, i-thixotropy, i-rheology kanye nokuvumelana kwe-slurry ukuze sahlulele ukusebenza kwemikhiqizo ye-gypsum mortar.

Sicabangela ukulawulwa kwekhwalithi yenqubo yokubala i-desulfurization gypsum source calcining, ama-filler (usimende, i-fine aggregate, i-heavy calcium powder) kanye nezingxube (kungasetshenziswa ku-dispersed latex powder, i-hydroxypropyl methyl cellulose ether, i-expanded perlite, i-gypsum retarder) Ukukhetha ifomula yomkhiqizo iyonke kuyabiza.

I-Hydroxypropyl methyl cellulose etherngoba udaka lwe-gypsum luhlanzekile kakhulu futhi lusebenza kahle, futhi ludunyiswe kakhulu ngamakhasimende odaka lwe-gypsum.