Udaka oluxubile oluhlanganisiwe: Udaka oluxubile luhlobo lukasimende, okuhlanganisiwe okuhle, ukuhlanganiswa kwamanzi, futhi ngokuya ngesilinganiso esikhethekile, bese kufakwa esitolo esikhethekile esitsheni bese kusetshenziswa ingxube ephelile ye-wat.
I-Hydroxypropylm methylcellulose isetshenziswa njenge-ejenti yokugcina amanzi ngodaka kasimende kanye ne-retarder yempompo kadaka. Endabeni ye-gypsum njenge-binder yokuthuthukisa uhlelo lokusebenza lwe-application kanye nesikhathi esandisa khona, ukugcinwa kwamanzi kwe-HPMC kuvimbela ama-slurry kusuka ekuqhekekeni ngokushesha okukhulu ngemuva kokomiswa, futhi kuthuthukise amandla ngemuva kokuqina. Ukugcinwa kwamanzi kuyindawo ebalulekile ye-hydroxypropylllylylylylyly hpmc, futhi futhi kungukukhathazeka kwabakhiqizi abaningi basemaster-mix abaxuba abamanzi. Izici ezithinta umphumela wokugcinwa kwamanzi ngodaka oluxutshwe olumanzi lubandakanya inani le-HPMC elingeziwe, ukubonwa kwe-HPMC, ukubusa kwezinhlayiya kanye nokushisa kwendawo yokusebenzisa.
Kunemisebenzi emithathu eyinhloko ye-hydroxypropyllylyll hpmc ku-wortar emanzi, elinye lamandla okubamba amanzi, elinye ithonya ekuguquguqukeni kanye ne-twixotropy yodaka olumanzi, kanti lwesithathu ukusebenzisana nosimende. Ukugcinwa kwamanzi kwe-cellulose ether kuya ngesilinganiso sokutholwa kwamanzi kwesisekelo, ukwakheka kodaka, ukushuba kongqimba lwesidakamizwa, ukufunwa kwamanzi ngodaka, kanye nesikhathi sokusetha. Lapho kuphakama okusobala kwe-hydroxypropylllym methylcellulose, ngcono ukugcinwa kwamanzi.
Izici ezithinta ukugcinwa kwamanzi kodaka oluxutshwe namanzi kufaka i-cellulose ether vispelity, inani lokungezelela, usayizi wezinhlayiyana kanye nokushisa. Lapho kukhuphuka khona i-viscose ether, kungcono ukugcinwa kwamanzi. I-Viscosity iyipharamitha ebalulekile yokusebenza kwe-HPMC. Ngomkhiqizo ofanayo, imiphumela yokusebenzisa izindlela ezahlukahlukene ukukala ukubonakala kwehlukahluka kakhulu, futhi abanye banegebe eliphindwe kabili. Ngakho-ke, ukuqhathanisa kwe-viscosity kumele kwenziwe ngendlela efanayo yokuhlola, kufaka phakathi izinga lokushisa, i-spindle, njll.
Ngokuvamile, kuphakama i-viscosity, kungcono ukugcinwa kwamanzi. Kodwa-ke, ukukhuphuka kwesisindo esiphakeme, isisindo esiphakeme se-HPMC kanye ne-solubity ye-HPMC, enomthelela ongemuhle emandleni nasekwenzeni kokwakha kodaka. Lapho kuphakama i-viscosity, kusobala kakhulu umphumela wokuqina wodaka, kepha ahlobene ngqo. Lapho esekhuphuka i-viscosity, i-viscous mores ngodaka olumanzi, ingcono ukusebenza kwezokwakha, ukusebenza kwesikhafu se-viscous kanye nokunamathela ku-substrate. Kodwa-ke, amandla esandayo enhlaka kadaka olumanzi uqobo alusizi. Lezi zakhiwo ezimbili azinawo ukusebenza okusobala kwe-anti-sag. Ngokuphambene nalokho, ukubukeka okuphakathi nendawo okuphansi kodwa okuguquliwe i-hydroxypropyllylyly methylcellulose kusebenza kahle kakhulu ekuthuthukiseni amandla ahlelekile ngodaka olumanzi.
Lapho imali enkulu ye-cellulose ether eyengezwe ku-PMC emanzi udaka, okungcono ukugcinwa kwamanzi, kanye nokuphakama okuphezulu, ukugcinwa kwamanzi kangcono. Ubuhle futhi kuyinkomba yokusebenza ebalulekile ye-hydroxypropylylylylylylylyl.
Ubumsulwa be-hydroxypropylllylyly buye bube nethonya elithile ekugcinweni kwalo kwamanzi. Ngokuvamile, i-hydroxypropyll methylcellulose enokubonakala okufanayo nobunzima obuhlukile, incane ubumsulwa, incane ukugcinwa kwamanzi ngaphansi kwenani elifanayo lezengezo. okungcono.
Udaka oluxutshwe olumanzi, inani lokungezwa le-cellulose ether hpmc liphansi kakhulu, kepha lingathuthukisa kakhulu ukusebenza kosuku lwamanzi, futhi yisengezo esikhulu esithinta kakhulu ukusebenza ngodaka. Ukukhetha okufanele kwe-hydroxypropyllylylylylyly, ukusebenza kodumo omanzi kuthinteka kakhulu.
Isikhathi Sokuthumela: APR-25-2023