Danko shine muhimmin ma'auni na aikin ether cellulose.
Gabaɗaya magana, mafi girman danko, mafi kyawun tasirin riƙe ruwa na turmi gypsum. Duk da haka, mafi girman danko, mafi girman nauyin kwayoyin halitta na cellulose ether, da kuma raguwa mai dacewa a cikin solubility zai yi mummunan tasiri akan ƙarfin da aikin ginin turmi. Mafi girma da danko, mafi bayyananne tasirin thickening akan turmi, amma ba daidai ba ne kai tsaye.
Mafi girman danko, da ƙarin danko turmi zai kasance. A lokacin ginawa, ana nunawa a matsayin mai mannewa ga scraper da babban mannewa ga substrate. Amma ba ya taimaka da yawa don ƙara ƙarfin tsarin tsarin jika da kanta. Bugu da ƙari, a lokacin ginawa, aikin anti-sag na turmi rigar ba a bayyane yake ba. Akasin haka, wasu matsakaici da ƙananan danko amma gyare-gyaren ethers na methyl cellulose suna da kyakkyawan aiki wajen inganta ƙarfin tsarin jika.
Kayayyakin bangon gine-gine galibi gine-gine ne, kuma dukkansu suna da karfin shayar da ruwa. Duk da haka, ana shirya kayan gini na gypsum da ake amfani da shi don gina bango ta hanyar ƙara ruwa a bango, kuma ruwa yana da sauƙi ta hanyar bangon, wanda ya haifar da rashin ruwa da ake bukata don hydration na gypsum, yana haifar da matsala wajen gina ginin da kuma raguwa. Ƙarfin haɗin gwiwa, yana haifar da ɓarna, Matsalolin inganci irin su hollowing da peeling. Inganta riƙewar ruwa na kayan gini na gypsum zai iya inganta ingancin ginin da haɗin gwiwa tare da bango. Sabili da haka, wakili mai riƙe ruwa ya zama ɗaya daga cikin mahimman abubuwan haɗin ginin gypsum.
Ana amfani da gypsum mai ɗorewa, gypsum bonded, gypsum caulking, gypsum putty da sauran kayan aikin foda na gini. Don sauƙaƙe gini, ana ƙara gypsum retarders yayin samarwa don tsawaita lokacin ginin gypsum slurry. Tun da gypsum yana haɗuwa da Retarder, wanda ke hana tsarin hydration na gypsum hemihydrate. Irin wannan gypsum slurry yana buƙatar a ajiye shi a bango na 1 ~ 2H kafin ya saita. Yawancin bangon suna da abubuwan shayar da ruwa, musamman bangon bulo da siminti mai iska. bangon bango, allon rufewa mai laushi da sauran sabbin kayan bango masu nauyi, don haka yakamata a gudanar da jiyya na riƙe ruwa akan gypsum slurry don kauce wa canja wurin wani ɓangare na ruwa a cikin slurry zuwa bango, yana haifar da ƙarancin ruwa da rashin cika ruwa lokacin gypsum. slurry yana taurare. Sanadin rabuwa da peeling na haɗin gwiwa tsakanin gypsum da bangon bango. Bugu da ƙari na wakili mai kula da ruwa shine don kula da danshin da ke cikin gypsum slurry, don tabbatar da yanayin hydration na gypsum slurry a wurin dubawa, don tabbatar da ƙarfin haɗin gwiwa. Abubuwan da aka saba amfani da su na riƙe ruwa sune cellulose ethers, irin su methyl cellulose (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose (HEMC), da dai sauransu. Bugu da ƙari, polyvinyl barasa, sodium alginate, modified sitaci, diatomaceous ƙasa, rare ƙasa. foda, da sauransu kuma za a iya amfani da su don inganta aikin riƙe ruwa.
Ko da wane nau'in wakili mai riƙe da ruwa zai iya jinkirta ƙimar hydration na gypsum zuwa digiri daban-daban, lokacin da adadin mai retarder ya kasance baya canzawa, wakilin mai riƙe da ruwa na iya jinkirta saitin na tsawon mintuna 15-30. Sabili da haka, ana iya rage adadin retarder yadda ya kamata.
Lokacin aikawa: Fabrairu-08-2023