Yadda za a zabi hydroxypropyl methylcellulose don turmi plaster?

Babban darajar pH na samfuran gypsum shine acidic ko tsaka tsaki. Yanzu akwai nau'ikan gini iri biyuhydroxypropyl methylcellulosea kasuwa: jinkirin narkar da cellulose da cellulose nan take (S). Nan take cellulose bai dace da tsarin gypsum ba. Products, da solubility ne sosai matalauta a karkashin acidic ko tsaka tsaki yanayi, da kuma jinkirin-dissolving hydroxypropyl methylcellulose za a iya narkar da a gypsum kayayyakin, amma jinkiri-narke cellulose yana da wani gagarumin hasara, yana da sauki agglomerate (lokacin da gypsum Bayan turmi aka zuga). bango na ɗan gajeren lokaci, ƙananan ƙwanƙwasa ƙwanƙwasa suna bayyana a saman). A halin yanzu, a cikin samfuran gypsum, musamman a cikin injin gypsum turmi, ana buƙatar cewa ether cellulose za a iya tarwatse gabaɗaya kuma a narkar da shi cikin kankanin lokaci, wanda ke buƙatar yin zurfin bincike akan ether cellulose mai saurin narkewa. tsarin samarwa. Surface jiyya (ba abin da ake kira Bugu da kari na sauran Additives a talakawa sa cellulose ether), don daidaita da gypsum turmi tsarin. Hydroxypropyl methylcellulose ether tare da zurfin saman jiyya na iya samun barga rushewar lokaci da kuma kyau inji Properties a gypsum turmi, kuma zai iya muhimmanci inganta matakin da karewa tsari na turmi.

Turmi gypsum da aka fesa na'ura gabaɗaya yana amfani da ƙarancin danko hydroxypropyl methylcellulose ether tsakanin 20,000 da 75,000, kuma ƙarin adadin shine gabaɗaya 0.2% zuwa 0.4%. Lokacin saita turmi gypsum mai fesa injin ana sarrafa shi a kusan awa 1. Muna amfani da gypsum turmi samar da danniya, filastik danko, thixotropy, rheology da daidaito na slurry don yin hukunci da aikin gypsum turmi kayayyakin.

Mun yi la'akari da ingancin iko desulfurization gypsum tushen calcining tsari, fillers (ciminti, lafiya tara, nauyi alli foda) da kuma admixtures (za a iya amfani da a watsar da latex foda, hydroxypropyl methyl cellulose ether, kumbura perlite, gypsum retarder) The zabi na overall dabarar samfurin farashi-tasiri.

Hydroxypropyl methyl cellulose etherdon turmi gypsum yana da tsabta mai kyau da aiki mai kyau, kuma abokan ciniki na gypsum turmi sun yaba da shi sosai.