Eminyakeni yamuva nje, ngokuthuthukiswa okuqhubekayo kobuchwepheshe bokufaka ukushisa odongeni lwangaphandle, inqubekelaphambili eqhubekayo yobuchwepheshe bokukhiqiza i-hydroxypropyl methyl cellulose, kanye nezici ezinhle kakhulu ze-hydroxypropyl methyl cellulose HPMC uqobo, i-hydroxypropyl methyl cellulose HPMC isetshenziswe kabanzi embonini yezokwakha.
isikhathi sokusetha
Isikhathi sokubeka ukhonkolo ngokuyinhloko sihlobene nesikhathi sokusetha sikasimende, futhi i-aggregate inethonya elincane.Ngakho-ke, isikhathi sokumiswa kodaka singasetshenziswa ukufaka esikhundleni socwaningo ngomthelela we-HPMC ngesikhathi sokumiswa kwengxube kakhonkolo engaphansi kwamanzi engahlakazi.Njengoba isikhathi sokubeka udaka sithinteka isilinganiso se-samente samanzi kanye nesilinganiso sesihlabathi se-cement, ukuze kuhlolwe ithonya le-HPMC ngesikhathi sokubeka udaka, kuyadingeka ukulungisa isilinganiso se-cement samanzi kanye nesilinganiso sesihlabathi se-samente sodaka.
Ukusabela kokuhlola kubonisa ukuthi ukungezwa kwe-HPMC kunomphumela wokuvinjelwa kwengxube yodaka, futhi isikhathi sokumiswa sodaka sikhuphuka ngokunyuka kwenani le-cellulose ether HPMC.Ngenani elifanayo le-HPMC, isikhathi sokusetha sodaka olwakhiwe ngaphansi kwamanzi side kunaleso esakhiwe emoyeni.Uma kulinganiswa emanzini, isikhathi sokusetha sodaka oluxutshwe ne-HPMC singu-6~18h kamuva esimisweni sokuqala kanye no-6~22h kamuva esimweni sokugcina kunaleso sesampula esingenalutho.Ngakho-ke, i-HPMC kufanele isetshenziswe kanye ne-ejenti yamandla yangaphambi kwesikhathi.
I-HPMC iyi-polymer enesakhiwo somugqa we-macromolecular, enamaqembu e-hydroxyl emaqenjini asebenzayo, angakha amabhondi e-hydrogen ngokuxuba ama-molecule amanzi ukuze kwandiswe i-viscosity yokuxuba amanzi.Amaketanga amade wamangqamuzana e-HPMC azodonselana, enze ama-molecule e-HPMC ahlangane ukuze akhe uhlaka lwenethiwekhi, nokusonga usimende nokuxuba amanzi.Njengoba i-HPMC yakha uhlaka lwenethiwekhi olufana nefilimu futhi isonga usimende, ingavimbela ngempumelelo ukushibilika kwamanzi odakeni futhi ivimbele noma ibambezele izinga lokugeleza kukasimende.
Ukopha
Isimo esophayo sodaka siyefana nesikakhonkolo, okuzodala ukuxazululwa okukhulu kwama-aggregates, kwandise isilinganiso sikasimende wamanzi odaka oluphezulu lwengqimba, kubangele udaka oluphezulu oluphezulu lube nokushwabana okukhulu kwepulasitiki, noma ngisho nokuqhekeka ekuqaleni, futhi amandla obuso obudaka abuthaka.
Lapho umthamo ungaphezu kuka-0.5%, akukho ukopha.Lokhu kungenxa yokuthi lapho i-HPMC ixutshwa nodaka, i-HPMC inokwakheka kwefilimu kanye nesakhiwo se-reticular, kanye ne-adsorption ye-hydroxyl ochungechungeni olude lwe-macromolecule, okwenza usimende nokuxutshwa kwamanzi kufomu lodaka ku-flocculent, iqinisekisa ukwakheka okuzinzile kwe-macromolecule. udaka.Uma i-HPMC yengezwa odakeni, amabhamuza amaningi amancane azimele azokwakhiwa.Lawa mabhamuza azosatshalaliswa ngokulinganayo odakeni futhi avimbele ukubekwa kwama-aggregate.Lokhu kusebenza kobuchwepheshe kwe-HPMC kunomthelela omkhulu ezintweni ezisekelwe kusimende, futhi kuvame ukusetshenziselwa ukulungisa izinhlanganisela ezintsha ezisekelwe kusimende njengodaka olomile nodaka lwe-polymer, ukuze zibe nokugcinwa kahle kwamanzi nepulasitiki.
Isidingo samanzi sodaka
Uma inani le-HPMC lilincane kakhulu, linomthelela omkhulu esidingweni samanzi sodaka.Ngaphansi kombandela wokuthi ukunwetshwa kodaka olusha kuyefana ngokuyisisekelo, inani le-HPMC kanye nesidingo samanzi sodaka kushintsha ngokuhambisana esikhathini esithile, futhi isidingo samanzi sodaka siyehla kuqala bese siyakhuphuka.Uma okuqukethwe kwe-HPMC kungaphansi kuka-0.025%, ngokwanda kokuqukethwe kwe-HPMC, isidingo samanzi sodaka siyehla ngaphansi kwezinga elifanayo lokunweba, okubonisa ukuthi okukuncane kokuqukethwe kwe-HPMC, umphumela wokunciphisa amanzi wodaka.Umphumela wokungenisa umoya we-HPMC wenza udaka lube nenani elikhulu lamabhamuza amancane azimele, adlala indima ekugcobiseni nasekuthuthukiseni ukugeleza kodaka.Lapho umthamo ungaphezu kuka-0.025%, isidingo samanzi sodaka siyakhula ngokunyuka komthamo, okubangelwa ubuqotho obuqhubekayo besakhiwo senethiwekhi ye-HPMC, ukufinyezwa kwegebe phakathi kwama-flocs ochungechungeni olude lwamangqamuzana, ukukhanga nokubumbana, kanye nokuncipha koketshezi lodaka.Ngakho-ke, lapho idigri yokwandisa ifana ngokuyisisekelo, i-slurry ibonisa ukwanda kwesidingo samanzi.
Isikhathi sokuthumela: Nov-25-2022