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, ngemva 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, i-spalling 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 zempuphu yokwakha 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 gypsum ivinjelwa ngokungeza i-retarder ku-gypsum, lolu hlobo lwe-gypsum ludinga ukuhlala odongeni kanye namahora amaningi ngaphambi kokubeka i-gypsum odongeni. babe nempahla yokumunca amanzi, ikakhulukazi, izinto ezintsha zodonga ezingasindi ezifana nezindonga zezitini, izindonga zikakhonkolo ezine-aerated, amaphaneli okufakwa okushisayo anembobo, ukuze kwenziwe ukwelashwa okugcina amanzi kwe-gypsum slurry, ukugwema ukudluliselwa kokunye kwamanzi odongeni, kubangela ukunamathisela kwe-gypsum kuqina lapho ukushoda kwamanzi, igobolondo elihlangene lingaqedi. 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 esishintshiwe, i-diatomite kanye ne-powder yomhlaba engavamile ingasetshenziswa futhi ukuthuthukisa ukugcinwa kwamanzi.
Isikhathi sokuthumela: Jul-26-2023