Udaka oluxubekile olumanzi: udaka oluxubekile uhlobo lukasimende, iqoqo elihle, ingxube namanzi, futhi ngokusho kwezakhiwo zezingxenye ezihlukahlukene, ngokwesilinganiso esithile, ngemva kokukalwa esiteshini sokuxuba, kuxutshwe, kuhanjiswe endaweni lapho kusetshenziswa khona iloli, futhi kufakwe esitolo esikhethekile esitsheni bese usebenzisa ingxube emanzi eqediwe isikhathi esibekiwe.
IHydroxypropyl methylcellulose isetshenziswa njenge-ejenti egcina amanzi odakeni lukasimende kanye ne-retarder yokumpompa udaka. Endabeni ye-gypsum njengesibophezelo sokuthuthukisa isicelo nokwandisa isikhathi sokusebenza, ukugcinwa kwamanzi kwe-HPMC kuvimbela udaka ekuqhekekeni ngokushesha ngemva kokoma, futhi kuthuthukisa amandla ngemva kokuqina. Ukugcinwa kwamanzi kuyimpahla ebalulekile ye-hydroxypropyl methylcellulose HPMC, futhi kuphinde kube yinto ekhathaza abakhiqizi abaningi basekhaya bemiksi emanzi. Izinto ezithinta umphumela wokugcina amanzi wodaka oluxutshwe okumanzi zihlanganisa inani le-HPMC elingeziwe, i-viscosity ye-HPMC, ukucoleka kwezinhlayiya kanye nezinga lokushisa lendawo esetshenziswayo.
Kunemisebenzi emithathu eyinhloko ye-hydroxypropyl methylcellulose HPMC odakeni lwengxube emanzi, owodwa uwumthamo omuhle kakhulu wokubamba amanzi, omunye umthelela wokungaguquguquki kanye ne-thixotropy ye-wet-mix mortar, kanti eyesithathu ukusebenzisana nosimende. Ukugcinwa kwamanzi kwe-cellulose ether kuncike esilinganisweni sokumuncwa kwamanzi kwesisekelo, ukwakheka kodaka, ukujiya kongqimba lodaka, isidingo samanzi sodaka, kanye nesikhathi sokusetha. Uma kuphezulu ukucaca kwe-hydroxypropyl methylcellulose, kuba ngcono ukugcinwa kwamanzi.
Izinto ezithinta ukugcinwa kwamanzi kodaka oluxubene olumanzi zihlanganisa i-cellulose ether viscosity, inani elingeziwe, usayizi wezinhlayiyana nezinga lokushisa. Uma kukhulu i-viscosity ye-cellulose ether, kungcono ukugcina amanzi. I-Viscosity iyipharamitha ebalulekile yokusebenza kwe-HPMC. Ngomkhiqizo ofanayo, imiphumela yokusebenzisa izindlela ezahlukene zokulinganisa i-viscosity ihluka kakhulu, kanti abanye baze babe negebe eliphindwe kabili. Ngakho-ke, ukuqhathanisa i-viscosity kufanele kwenziwe ngendlela efanayo yokuhlola, kufaka phakathi izinga lokushisa, i-spindle, njll.
Ngokuvamile, ukuphakama kwe-viscosity, kungcono ukugcina amanzi. Kodwa-ke, ukuphakama kwe-viscosity, ukuphakama kwesisindo samangqamuzana e-HPMC kanye ne-solubility ephansi ye-HPMC, okunomthelela omubi emandleni nokusebenza kokwakhiwa kodaka. Ukuphakama kwe-viscosity, kusobala kakhulu umphumela wokuqina wodaka, kodwa awuhlobene ngokuqondile. Ukuphakama kwe-viscosity, i-viscous yodaka olumanzi, ngcono ukusebenza kokwakhiwa, ukusebenza kwe-viscous scraper kanye nokunyuka kokunamathela ku-substrate. Kodwa-ke, ukwanda kwamandla esakhiwo sodaka olumanzi ngokwalo akusizi. Lezi zakhiwo ezimbili azikho ukusebenza okusobala kwe-anti-sag. Ngokuphambene, i-viscosity ethile emaphakathi nephansi kodwa i-hydroxypropyl methylcellulose eshintshiwe inokusebenza okuhle kakhulu ekuthuthukiseni amandla esakhiwo sodaka olumanzi.
Uma sikhulu inani le-cellulose ether engezwe odakeni olumanzi lwe-PMC, kuba ngcono ukugcinwa kwamanzi, futhi ukuphakama kwe-viscosity, ukugcinwa kwamanzi kungcono. Ubuhle buphinde bube yinkomba yokusebenza ebalulekile ye-hydroxypropyl methylcellulose.
Ukucoleka kwe-hydroxypropyl methylcellulose nakho kunomthelela othile ekugcineni amanzi. Ngokuvamile, ku-hydroxypropyl methylcellulose ene-viscosity efanayo kanye nokucoleka okuhlukile, ukucoleka kuncane, umphumela wokugcina amanzi ube mncane ngaphansi kwesamba esifanayo sokwengezwa. okungcono.
Ngodaka oluxubile olumanzi, inani elingeziwe le-cellulose ether HPMC liphansi kakhulu, kodwa lingathuthukisa kakhulu ukusebenza kokwakhiwa kodaka olumanzi, futhi liyisithasiselo esiyinhloko esithinta kakhulu ukusebenza kodaka. Ukukhetha okunengqondo kwe-hydroxypropyl methylcellulose, ukusebenza kodaka olumanzi kuthinteka kakhulu.
Isikhathi sokuthumela: Apr-25-2023