Ibaluleke kangakanani i-viscosity ye-methyl cellulose ether ku-gypsum mortar?

Ibaluleke kangakanani i-viscosity ye-methyl cellulose ether ku-gypsum mortar?

Impendulo: I-Viscosity iyipharamitha ebalulekile ekusebenzeni kwe-methyl cellulose ether.

Ngokuvamile, ukuphakama kwe-viscosity, kuba ngcono umphumela wokugcina amanzi we-gypsum mortar.Kodwa-ke, ukuphakama kwe-viscosity, ukuphakama kwesisindo se-molecule ye-methyl cellulose ether, kanye nokwehla okuhambisanayo ekuncibilikeni kwayo kuzoba nomthelela omubi emandleni nasekusebenzeni kokwakhiwa kodaka.Ukuphakama kwe-viscosity, kusobala kakhulu umphumela wokuqina odongeni, kodwa awulingani ngokuqondile.Ukuphakama kwe-viscosity, i-viscous yodaka olumanzi luyoba lukhulu.Ngesikhathi sokwakhiwa, kubonakala njengokunamathela ku-scraper nokunamathela okuphezulu ku-substrate.Kodwa akusizi ukwandisa amandla esakhiwo sodaka olumanzi ngokwalo.Ngaphezu kwalokho, ngesikhathi sokwakhiwa, ukusebenza kwe-anti-sag kodaka olumanzi akubonakali.Ngokuphambene, i-viscosity ethile emaphakathi nephansi kodwa eshintshiwe ye-methyl cellulose ethers inokusebenza okuhle kakhulu ekuthuthukiseni amandla esakhiwo sodaka olumanzi.

Kubaluleke kangakanani ukucoleka kwe-cellulose ether odakeni?

Impendulo: I-fineness iyinkomba yokusebenza ebalulekile ye-methyl cellulose ether.I-MC esetshenziselwa udaka lwempushana eyomile idingeka ukuthi ibe yimpushana enamanzi aphansi, futhi ukucoleka kudinga u-20% kuya ku-60% wosayizi wezinhlayiyana ukuba ube ngaphansi kwama-63m.Ukucoleka kuthinta ukunyibilika kwe-methyl cellulose ether.I-coarse MC ivamise ukuba yi-granular, okulula ukuyihlakaza nokuncibilika emanzini ngaphandle kwe-agglomeration, kodwa izinga lokuhlakazeka lihamba kancane kakhulu, ngakho-ke alifanelekile ukusetshenziswa kudaka olomile lwempuphu.Eminye imikhiqizo yasekhaya i-flocculent, akulula ukuyihlakaza futhi incibilike emanzini, futhi kulula ukuyihlanganisa .Odakeni lwempushana eyomile, i-MC ihlakazeka phakathi kwezinto zikasimende njenge-aggregate, isigcwalisi esihle nosimende, futhi impushana enhle kuphela eyanele engagwema i-methyl cellulose ether agglomeration lapho ixutshwa namanzi.Lapho i-MC yengezwe ngamanzi ukuze ihlakaze ama-agglomerate, kunzima kakhulu ukuhlakazeka nokuhlakazeka.I-coarse MC ayigcini nje ngokumosha, kodwa futhi inciphisa amandla endawo odaka.Uma udaka olunjalo lwempuphu eyomile lusetshenziswa endaweni enkulu, isivinini sokuphulukisa sodaka lwendawo sizoncishiswa kakhulu, futhi imifantu izovela ngenxa yezikhathi ezihlukene zokuphulukisa.Ngodaka olufuthwe ngokwakhiwa kwemishini, imfuneko yokucwenga iphakeme ngenxa yesikhathi esifushane sokuxuba.

Ukucoleka kwe-MC nakho kunomthelela othile ekugcineni kwayo amanzi.Ngokuvamile, kuma-methyl cellulose ether ane-viscosity efanayo kodwa ukucoleka okuhlukile, ngaphansi kwenani elifanayo lesengezo, ukucoleka kuya kuba ngcono umphumela wokugcina amanzi.

Ithini indlela yokukhetha i-cellulose?

Impendulo: Inani le-cellulose ether elisetshenziswa ezinhlelweni ezahlukene lisekelwe ikakhulukazi esidingweni sokugcinwa kwamanzi.Ifanele zonke izinhlobo zodaka.Ama-substrates amunca kakhulu adinga amanani aphezulu e-cellulose ether.Izinsimbi ezinosayizi wezinhlayiyana ezifanayo zokusabalalisa futhi ngaleyo ndlela indawo enkulu engaphezulu nazo zidinga amanani aphezulu e-cellulose ether.

Ukucaciswa okuguquliwe kungakhethelwa izimfuneko zokulwa nokuncipha.Uma ukuguqulwa kungenele, ama-starch ethers, ngokuvamile i-hydroxypropyl starch ethers, anganezelwa ukuvimbela ama-sags.

Inani eliphelele kanye nosayizi wezinhlayiyana zama-fillers ekwakhiweni kufanele kukhethwe ukuze kunikeze ubushelelezi nokuvumelana okuhle.

Ukuxuba i-gypsum, i-filler, uhlobo kanye nenani le-cellulose ether kanye nendlela yokusebenzisa i-starch ether kufanele kuhlanganiswe nezindlela ezilandelayo:

Lapho udaka oluxubekile olomile lwengezwe enanini elithile lamanzi, inani elengeziwe lisekelwe enanini lamanzi, futhi wonke amanzi afakwe emanzini ngaphandle kokugqugquzela impushana eyomile ngesilinganiso esifanele samanzi-to-paste.Uma izithako ezihlukene zixubene ngesilinganiso esifanele, khona-ke singathola udaka olubushelelezi olunezici ezifanele zokufaka isicelo ngemva kokuxuba.

Yiziphi izinguquko zokwakha i-gypsum yi-ejenti yokugcina amanzi?

Impendulo: Izinto zokwakha zodonga ngokuvamile ziyizakhiwo ezinezimbobo, futhi zonke zinokumuncwa okuqinile kwamanzi.Kodwa-ke, izinto zokwakha ze-gypsum ezisetshenziselwa ukwakhiwa kodonga zilungiswa ngokungeza amanzi odongeni, futhi amanzi adonswa kalula odongeni, okuholela ekuntulekeni kwamanzi adingekayo ukuze kufakwe i-hydration ye-gypsum, okuholela ebunzimeni ekwakhiweni kwe-plastering nokunciphisa. amandla esibopho, okuholela ekuqhekekeni, Izinkinga zekhwalithi ezifana nokubhoboza nokuxebuka.Ukuthuthukisa ukugcinwa kwamanzi kwezinto zokwakha ze-gypsum kungathuthukisa ikhwalithi yokwakha kanye namandla okubopha ngodonga.Ngakho-ke, i-ejenti yokugcina amanzi isiphenduke enye yezingxube ezibalulekile zezinto zokwakha ze-gypsum.

Ama-ejenti agcina amanzi asetshenziswa kakhulu ezweni lami i-carboxymethyl cellulose ne-methyl cellulose.Lawa ma-ejenti amabili agcina amanzi aphuma ku-ether ku-cellulose.Zonke zinomsebenzi ongaphezulu, futhi kukhona amaqembu e-hydrophilic ne-hydrophobic kuma-molecule awo, ane-emulsification, i-colloid evikelayo kanye nokuzinza kwesigaba.Ngenxa ye-viscosity ephezulu yesisombululo sayo samanzi, lapho sengezwa odakeni ukuze kugcinwe okuqukethwe kwamanzi amaningi, kungavimbela ngokuphumelelayo ukumuncwa kwamanzi ngokweqile yi-substrate (njengezitini, ukhonkolo, njll.) futhi kunciphise izinga lokuhwamuka. yamanzi, ngaleyo ndlela idlala indima emthelela wokugcina amanzi.I-Methyl cellulose iyinhlanganisela ekahle ye-gypsum ehlanganisa ukugcinwa kwamanzi, ukuqina, ukuqinisa nokuqina, kodwa intengo iphakeme kakhulu.Ngokuvamile, i-ejenti eyodwa yokugcina amanzi ayikwazi ukufeza umphumela omuhle wokugcina amanzi, futhi ukuhlanganiswa kwama-ejenti ahlukene okugcina amanzi angakwazi nje ukuthuthukisa umphumela wokusetshenziswa, kodwa futhi kunciphise izindleko zezinto ezisekelwe ku-gypsum.

Ukugcinwa kwamanzi kuzithinta kanjani izakhiwo ze-gypsum composite cementitious materials?

Impendulo: Izinga lokugcinwa kwamanzi liyakhuphuka ngokungezwa kwe-methyl cellulose ether ebangeni lika-0.05% kuya ku-0.4%.Lapho inani elingeziwe likhuphuka, inkambiso yokwanda kokugcinwa kwamanzi yehla.