I-viscosity ephezulu ye-cellulose ether ingathuthukisa ukusebenza kokugcinwa kwamanzi kwe-gypsum mortar?

I-viscosity iyipharamitha ebalulekile yokusebenza kwe-cellulose ether.

Ngokuvamile, ukuphakama kwe-viscosity, kuba ngcono umphumela wokugcina amanzi we-gypsum mortar.Kodwa-ke, ukuphakama kwe-viscosity, ukuphakama kwesisindo se-cellulose ether, kanye nokwehla okuhambisanayo kokuncibilika 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 kakhulu ukukhulisa amandla esakhiwo sodaka olumanzi ngokwalo.Ngaphezu kwalokho, ngesikhathi sokwakhiwa, ukusebenza kwe-anti-sag kodaka olumanzi akubonakali.Ngokuphambene nalokho, i-viscosity ethile emaphakathi nephansi kodwa eshintshiwe ye-methyl cellulose ethers inokusebenza okuhle kakhulu ekuthuthukiseni amandla esakhiwo sodaka olumanzi.

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.

I-gypsum yokunamathisela, i-gypsum eboshiwe, i-caulking gypsum, i-gypsum putty nezinye izinto zokwakha zempuphu ziyasetshenziswa.Ukuze kube lula ukwakhiwa, ama-retarders e-gypsum ayengezwa ngesikhathi sokukhiqiza ukwandisa isikhathi sokwakhiwa kwe-gypsum slurry.Njengoba i-gypsum ixubene ne-Retarder, evimbela inqubo ye-hydration ye-hemihydrate gypsum.Lolu hlobo lwe-gypsum slurry ludinga ukugcinwa odongeni isikhathi esingu-1~2H ngaphambi kokuthi lumiswe.Izindonga eziningi zinezakhiwo zokumunca amanzi, ikakhulukazi izindonga zezitini nokhonkolo ofakwe umoya.I-Wall, i-porous insulation board kanye nezinye izinto ezintsha ezingasindi zodonga, ngakho-ke ukwelashwa kokugcinwa kwamanzi kufanele kwenziwe ku-slurry ye-gypsum ukugwema ukudluliswa kwengxenye yamanzi odongeni, okuholela ekusweleni kwamanzi kanye ne-hydration engaphelele lapho i-gypsum. i-slurry iqinile.Banga ukuhlukana nokuxebuka kwelunga phakathi kwe-gypsum nodonga olungaphezulu.Ukwengezwa kwe-ejenti egcina amanzi ukugcina umswakama oqukethwe ku-gypsum slurry, ukuqinisekisa ukusabela kwe-hydration ye-gypsum slurry esibonakalayo, ukuze kuqinisekiswe amandla okubopha.Ama-ejenti okugcina amanzi asetshenziswa kakhulu ama-cellulose ethers, afana ne-methyl cellulose (MC), i-hydroxypropyl methyl cellulose (HPMC), i-hydroxyethyl methyl cellulose (HEMC), njll. Ngaphezu kwalokho, i-polyvinyl alcohol, i-sodium alginate, isitashi esilungisiwe, umhlaba we-diatomaceous, umhlaba ongavamile. impushana, njll. ingasetshenziswa futhi ukuthuthukisa ukusebenza kokugcinwa kwamanzi.

Akunandaba ukuthi hlobo luni lwe-ejenti egcina amanzi engalibazisa izinga lokufakwa kwamanzi kwe-gypsum kuye kumazinga ahlukahlukene, lapho umthamo we-retarder uhlala ungashintshiwe, i-ejenti egcina amanzi ngokuvamile ingakwazi ukuhlehlisa ukulungiselelwa imizuzu engu-15-30.Ngakho-ke, inani le-retarder lingancishiswa ngokufanelekile.