I-viscosity ephezulu ye-cellulose ether inokuphucula ukusebenza kokugcinwa kwamanzi kwi-gypsum mortar?

I-Viscosity yiparameter ebalulekileyo yokusebenza kwe-cellulose ether.

Ngokuqhelekileyo, okukhona i-viscosity iphezulu, kokukhona isiphumo sokugcina amanzi kwi-gypsum mortar.Nangona kunjalo, ukuphakama kwe-viscosity, ukuphakama kwe-molecular weight of cellulose ether, kunye nokuncipha okuhambelanayo kwi-solubility yayo kuya kuba nefuthe elibi kumandla kunye nokusebenza kokwakhiwa kodaka.Ukuphakama kwe-viscosity, kuyabonakala ngakumbi umphumo wokuqina kumdaka, kodwa awuhambelani ngokuthe ngqo.

Ukuphakama kwe-viscosity, i-viscous ngakumbi udaka olumanzi luya kuba.Ngexesha lokwakhiwa, kubonakaliswa njengokunamathela kwi-scraper kunye nokunamathela okuphezulu kwi-substrate.Kodwa akuncedi kakhulu ukunyusa amandla esakhiwo sodaka olumanzi ngokwalo.Ukongezelela, ngexesha lokwakha, ukusebenza kwe-anti-sag yodaka olumanzi alubonakali.Ngokuchasene noko, i-viscosity ethile ephakathi kunye nephantsi kodwa i-methyl cellulose ethers elungisiweyo inomsebenzi ogqwesileyo ekuphuculeni amandla okwakhiwa kodaka olumanzi.

Izixhobo zodonga lokwakha ubukhulu becala zizakhiwo ezinemingxuma, kwaye zonke zinokufunxa okuqinileyo kwamanzi.Nangona kunjalo, izinto zokwakha ze-gypsum ezisetyenziselwa ukwakhiwa kweendonga zilungiswa ngokugalela amanzi eludongeni, kwaye amanzi athatyathwa lula eludongeni, okubangele ukungabikho kwamanzi ayimfuneko kwi-hydration ye-gypsum, okubangela ubunzima ekwakhiweni kokutyabeka kunye nokunciphisa. amandla bond, okubangela iintanda, Iingxaki zoMgangatho ezifana nemingxuma kunye nokuxobula.Ukuphucula ukugcinwa kwamanzi kwizixhobo zokwakha ze-gypsum kunokuphucula umgangatho wokwakha kunye namandla okudibanisa nodonga.Ke ngoko, iarhente yokugcina amanzi ibe yenye yezinto ezixubeneyo ezibalulekileyo zezinto zokwakha zegypsum.

I-gypsum yokutyabeka, i-gypsum edibeneyo, i-caulking gypsum, i-gypsum putty kunye nezinye izinto zokwakha zomgubo zisetyenziswa.Ukuze kuququzelelwe ukwakhiwa, i-gypsum retarders yongezwa ngexesha lokuvelisa ukwandisa ixesha lokwakhiwa kwe-gypsum slurry.Ekubeni i-gypsum ixutywe ne-Retarder, evimbela inkqubo ye-hydration ye-hemihydrate gypsum.Olu hlobo lwe-gypsum slurry kufuneka lugcinwe eludongeni i-1 ~ 2H ngaphambi kokuba lusete.Uninzi lweendonga zineempawu zokufunxa amanzi, ngakumbi iindonga zezitena kunye nekhonkrithi ene-aerated.Udonga, ibhodi yokugquma i-porous kunye nezinye izinto ezintsha zodonga ezikhaphukhaphu, ngoko ke unyango lokugcina amanzi kufuneka lwenziwe kwi-gypsum slurry ukuphepha ukuhanjiswa kwenxalenye yamanzi kwi-slurry eludongeni, okukhokelela ekunqongophelweni kwamanzi kunye ne-hydration engaphelelanga xa i-gypsum. udaka luqina.Ibangela ukwahlukana kunye nokuxobula umdibaniso phakathi kwegypsum kunye nodonga lomhlaba.Ukongezwa kwe-arhente yokugcina amanzi kukugcina umswakama oqulethwe kwi-gypsum slurry, ukuqinisekisa ukuphendulwa kwe-hydration ye-gypsum slurry kwi-interface, ukwenzela ukuba kuqinisekiswe amandla okudibanisa.Ii-agents ezisetyenziswa ngokuqhelekileyo zokugcina amanzi zi-cellulose ethers, ezifana ne-methyl cellulose (MC), i-hydroxypropyl methyl cellulose (HPMC), i-hydroxyethyl methyl cellulose (HEMC), njl. umgubo, njl.

Kungakhathaliseki ukuba luhlobo luni lwe-ejenti yokugcina amanzi inokulibazisa izinga le-hydration ye-gypsum ukuya kumaqondo ahlukeneyo, xa i-dosage ye-retarder ihlala ingaguquki, i-agent egcina amanzi inokubuyisela ngokubanzi ukuseta kwi-15-30 imizuzu.Ngoko ke, umthamo we-retarder unokuncitshiswa ngokufanelekileyo.