I-viscosity iyipharamitha yempahla ebalulekile ye-cellulose ether.Ngokuvamile, ukuphakama kwe-viscosity, kuba ngcono umphumela wokugcina amanzi we-gypsum mortar.Kodwa-ke, lapho i-viscosity iphezulu, isisindo se-molecule ye-cellulose ether siphezulu, futhi ukuncibilika kwe-cellulose ether kuncipha ngokufanele.Lapho i-viscosity iphezulu, umphumela wokujiya ubonakala ngokusobala, kodwa awulingani.Ukuphakama kwe-viscosity, udaka olumanzi luyoba lukhulu, ekwakhiweni, ukusebenza kokunamathela kwe-scraper nokunamathela okuphezulu ku-substrate.Kodwa akusizi ukwandisa amandla esakhiwo sodaka olumanzi ngokwalo.Ngaphezu kwalokho, ngesikhathi sokwakhiwa, ukusebenza kokusebenza kodaka olumanzi anti-sagging akubonakali.Ngokuphambene, enye i-Methyl cellulose eguquliwe ene-viscosity ephansi kuya emaphakathi ibonise ukuthuthukiswa kwamandla esakhiwo sodaka olumanzi.Izinto zokwakha odongeni ikakhulukazi izakhiwo ezinama-porous, zinokumuncwa kwamanzi.Futhi izinto zokwakha ze-gypsum ezisetshenziselwa ukwakhiwa kodonga, ngemuva kokwengeza ukuguquguquka kwamanzi odongeni, umswakama kulula ukumuncwa odongeni, okwenza i-gypsum ingabi nomswakama odingekayo ukuze i-hydration, ibangele ubunzima ekwakhiweni kwe-plaster nokunciphisa amandla esibopho. , ngakho-ke kukhona ukuqhekeka, isigubhu esingenalutho, ukubhoboza nezinye izinkinga zekhwalithi.Ukuthuthukisa ukugcinwa kwamanzi kwezinto zokwakha ze-gypsum kungaxazulula inkinga yekhwalithi yokwakha futhi kuthuthukise amandla okubopha ngodonga.Ngakho-ke, i-ejenti yokugcina amanzi isibe yinye yezithako ezibalulekile zezinto zokwakha ze-gypsum.
Ukuze kube lula ukwakhiwa, kusetshenziswa izinto zokwakha zempuphu ezifana ne-plaster, i-adhesive plaster, i-jointing plaster kanye ne-plaster putty, futhi i-gypsum retarder yengezwa ekukhiqizeni ukwandisa isikhathi sokwakhiwa kwe-plaster paste, ngoba inqubo ye-hydration ye-hemihydrate. I-gypsum ivinjelwa ngokungeza i-retarder ku-gypsum, lolu hlobo lokunamathisela kwe-gypsum ludinga ukuhlala odongeni amahora angu-1-2 ngaphambi kokusetha, futhi iningi lezindonga linempahla yokumunca amanzi, ikakhulukazi, izinto ezintsha zodonga ezingasindi ezifana nezindonga zezitini, izindonga zikakhonkolo ezine-aerated, amaphaneli okufakelwa okushisayo afakwe i-perforated, ngakho-ke ukwenza ukwelashwa kokugcina amanzi kwe-gypsum slurry, ukugwema ukudluliswa kolunye udaka lwamanzi odongeni, kubangela ukuthi unamathisele we-gypsum ube lukhuni lapho ukushoda kwamanzi, ukugeleza kwamanzi kungaqedi. , ibangela i-gypsum kanye nodonga olungaphezulu kwendawo yokuhlukaniswa kwendawo, igobolondo.Ukwengeza i-ejenti egcina amanzi ukugcina umswakama oqukethwe ku-gypsum paste, ukuqinisekisa ukusabela kwe-hydration ye-gypsum paste endaweni obonakalayo, ngaleyo ndlela uqinisekise amandla ebhondi.Ama-ejenti ajwayelekile okugcina amanzi ama-cellulose ethers, njengeMethyl cellulose (MC) , i-hypromellose (I-HPMCi-hydroxyethyl methyl cellulose (I-HEMC), njll.Ngaphezu kwalokho, utshwala be-polyvinyl, i-alginate ye-sodium, isitashi esilungisiwe, i-diatomite kanye ne-powder yomhlaba engavamile ingasetshenziswa futhi ukuthuthukisa ukugcinwa kwamanzi.
Isikhathi sokuthumela: Jul-26-2023