Ukuqina kuyipharamitha ebalulekile yokusebenza kwe-cellulose ether.
Ngokuvamile, uma i-viscosity iphakeme, umphumela wokugcina amanzi we-gypsum mortar uba ngcono. Kodwa-ke, uma i-viscosity iphakeme, isisindo sama-molecule se-cellulose ether siphakeme, kanye nokwehla okuhambisanayo kokuncibilika kwayo kuzoba nomthelela omubi emandleni nasekusebenzeni kokwakhiwa kwe-mortar. Uma i-viscosity iphakeme, umphumela wokujiya ubonakala kakhulu ku-mortar, kodwa awulingani ngokuqondile.
Uma i-viscosity iphakeme, yilapho i-mortar emanzi izoba yinkimbinkimbi kakhulu. Ngesikhathi sokwakha, ibonakala njengokunamathela ku-scraper kanye nokunamathela okuphezulu ku-substrate. Kodwa akusizi kakhulu ukwandisa amandla esakhiwo se-mortar emanzi uqobo. Ngaphezu kwalokho, ngesikhathi sokwakha, ukusebenza kwe-mortar emanzi okulwa nokuwa akubonakali. Ngokuphambene nalokho, amanye ama-ether e-methyl cellulose ahlanganisiwe asebenza kahle kakhulu ekuthuthukiseni amandla esakhiwo se-mortar emanzi.
Izinto zokwakha odongeni ziyizakhiwo ezinezimbobo eziningi, futhi zonke zinokumuncwa kwamanzi okunamandla. Kodwa-ke, izinto zokwakha ze-gypsum ezisetshenziselwa ukwakha odongeni zilungiswa ngokungeza amanzi odongeni, futhi amanzi amuncwa kalula odongeni, okuholela ekusweleni kwamanzi adingekayo ukuze kufakwe i-gypsum, okubangela ubunzima ekwakhiweni kokuplasta kanye nokuncipha kwamandla ezibopho, okubangela imifantu, Izinkinga zekhwalithi njengokugoba nokuqhekeka. Ukuthuthukisa ukugcinwa kwamanzi kwezinto zokwakha ze-gypsum kungathuthukisa ikhwalithi yokwakha kanye namandla okubopha odongeni. Ngakho-ke, i-ejenti yokugcina amanzi isibe ngenye yezingxube ezibalulekile zezinto zokwakha ze-gypsum.
Kusetshenziswa i-plastering gypsum, i-bonded gypsum, i-caulking gypsum, i-gypsum putty nezinye izinto zokwakha eziwuphawuda. Ukuze kube lula ukwakha, ama-retarder e-gypsum ayengezwa ngesikhathi sokukhiqiza ukuze kwandiswe isikhathi sokwakha i-gypsum slurry. Njengoba i-gypsum ixutshwe ne-Retarder, okuvimbela inqubo yokumanzisa ye-hemihydrate gypsum. Lolu hlobo lwe-gypsum slurry ludinga ukugcinwa odongeni isikhathi esingu-1 ~ 2H ngaphambi kokuba lushe. Iningi lezindonga linezakhiwo zokumunca amanzi, ikakhulukazi izindonga zezitini kanye nokhonkolo ovunguzayo. Udonga, ibhodi lokufaka i-insulation elinezimbobo kanye nezinye izinto ezintsha zodonga ezilula, ngakho-ke ukwelashwa kokugcinwa kwamanzi kufanele kwenziwe ku-gypsum slurry ukuze kugwenywe ukudluliselwa kwengxenye yamanzi ku-slurry odongeni, okuholela ekushodeni kwamanzi kanye nokumanzisa okungaphelele lapho i-gypsum slurry iqina. Kubangela ukuhlukaniswa nokuqhekeka kwejoyinti phakathi kwe-gypsum nobuso bodonga. Ukwengezwa kwe-ejenti yokugcina amanzi ukugcina umswakama oqukethwe ku-slurry ye-gypsum, ukuqinisekisa ukusabela kokumanzisa kwe-slurry ye-gypsum endaweni yokuxhumana, ukuze kuqinisekiswe amandla okubopha. Ama-ejenti okugcina amanzi asetshenziswa kakhulu ama-ether e-cellulose, njenge-methyl cellulose (MC), i-hydroxypropyl methyl cellulose (HPMC), i-hydroxyethyl methyl cellulose (HEMC), njll. Ngaphezu kwalokho, i-polyvinyl alcohol, i-sodium alginate, i-modified starch, i-diatomaceous earth, i-rare earth powder, njll. angasetshenziswa futhi ukuthuthukisa ukusebenza kokugcinwa kwamanzi.
Kungakhathaliseki ukuthi uhlobo luni lwe-ejenti egcina amanzi engalibazisa izinga lokumanziswa kwe-gypsum ngamazinga ahlukahlukene, lapho umthamo we-retarder ungashintshi, i-ejenti egcina amanzi ngokuvamile ingalibazisa ukusetha imizuzu eyi-15-30. Ngakho-ke, inani le-retarder lingancishiswa ngokufanele.
Isikhathi sokuthunyelwe: Feb-08-2023