Gypsum retarder
Li-retardants tsa Gypsum li bapala karolo ea bohlokoa indastering ea kaho le thepa ea moaho, li sebeletsa ho laola nako ea ho beha lihlahisoa tse thehiloeng ho gypsum ho netefatsa ts'ebetso e ntle le ts'ebeliso. Har'a li-retardants tsena, li-organic acid, matsoai a qhibilihang, li-phosphates tsa motheo, le liprotheine ke likarolo tsa bohlokoa tse hlokomelehang ka katleho ea tsona. Li-organic acid tse hlahelletseng tse sebelisoang e le li-retarders li kenyelletsa citric acid, sodium citrate, tartaric acid, potassium tartrate, acrylic acid le sodium acrylate. Ka har'a sehlopha sena, citric acid le letsoai la eona la sodium li hapile tlhokomelo e kholo ka lebaka la thepa ea tsona ea ho lieha e bonts'itsoeng le ka litekanyetso tse nyane. Ts'ebetso ena e phahameng e thusa haholo lits'ebetsong tse fapaneng tsa gypsum, kaha e thusa nako e telele ea ho sebetsa ha e ntse e boloka boleng bo lakatsehang ba sehlahisoa sa ho qetela. Ntle le li-organic acid, li-phosphate retarders tse kang sodium hexametaphosphate le sodium polyphosphate li sebelisoa haholo. Lik'hemik'hale tsena li bohlokoa ho theheng lihlahisoa tsa gypsum, ho kenyelletsa le gypsum e kopantsoeng, gypsum putty, le lisebelisoa tse ling tse amehang tlhahisong ea thepa ea kaho ea gypsum. Mosebetsi o ka sehloohong oa li-retarders tsena tsa phosphate ke ho liehisa ts'ebetso ea condensation ea gypsum, e leng ho lumellang hore ho be le taolo e ntlafetseng nakong ea ho kopanya le ho sebetsa. Ka leano la ho kenyelletsa li-retardants tsena, bahlahisi ba ka ntlafatsa ts'ebetso ea lihlahisoa tsa gypsum, ka hona ba ntlafatsa ts'ebetso ea libaka tsa kaho le ho netefatsa hore thepa ea meralo e lakatsehang ea fihlelleha. Tlhokahalo ea li-retardants tse ka tšeptjoang le tse sebetsang li entse hore ho be le lipatlisiso tse pharaletseng sebakeng sena, haholo-holo ho shebana le mekhoa ea ho sebelisana ha lisebelisoa tsena le gypsum. Liphuputso li fana ka maikutlo a hore sebopeho sa limolek'hule tsa li-retarders li phetha karolo ea bohlokoa ts'ebetsong ea tsona, e leng se lebisang ho nts'etsopele ea mekhoa e mecha ea ho hlahisa melemo e mengata. Ha indasteri ea kaho e ntse e tsoela pele ho fetoha, tlhokahalo ea lihlahisoa tsa boleng bo holimo, tse tšoarellang tsa gypsum e lula e le teng. Ka lebaka leo, nts'etsopele le ts'ebeliso ea li-ajenti tsa morao-rao tsa morao-rao li bohlokoa bakeng sa ho fihlela litlhoko tse ntseng li eketseha tsa merero ea morao-rao ea kaho. Ho feta moo, moralo o tsotellang tikoloho oa lisebelisoa tsena o ntse o shejoa, o susumetsa bafuputsi ho hlahloba likhetho tse tšoarellang le mekhoa e meng e ka senyehang ho fapana le batho ba khale ba sa sebetseng. Tekatekano lipakeng tsa katleho le tšusumetso ea tikoloho e bohlokoa kaha baetsi ba sepheo ba ikemiselitse ho fana ka litharollo tse sebetsang hantle tsa gypsum tse tsamaellanang le lipheo tsa ts'ebetso ea indasteri. Ka kakaretso, ts'ebeliso ea li-retardants tsa gypsum, haholo li-organic acid, matsoai a qhibilihang, le phosphates, ke karolo ea bohlokoa ea lihlahisoa tsa kaho ea gypsum tse ntlafatsang ts'ebeliso ea tsona. Ka ho sebelisa mefuta e fapaneng ea li-agents tsa morao-rao, lihahi li ka netefatsa ts'ebetso e nepahetseng ea ts'ebetso le ho sireletsa bots'epehi le bophelo bo bolelele ba meaho. Khatelo-pele e tsoelang pele thutong ea gypsum retardation ha e ntlafatse ts'ebetso ea sehlahisoa feela empa hape e kenya letsoho mokhoeng o tsitsitseng haholoanyane indastering ea kaho, e qetellang e lebisitse ho litholoana tse betere mabapi le ts'ebetso le boikarabello ba tikoloho. Qetellong, ho utloisisa mefuta e fapaneng ea li-gypsum retardants tse ntseng li sebelisoa hona joale ho bohlokoa ho ba amehang lefapheng la kaho, kaha e ba fa matla a ho khetha li-additives tse nepahetseng tse finyellang liphello tse lakatsehang ha ba ntse ba khomarela mekhoa e tsitsitseng. Tsebo ena e ntšetsa pele lefapha la thepa ea kaho, e netefatsa hore bokamoso ba tlhahiso ea gypsum bo khetholloa ka boqapi, bokhabane, le tlhokomelo ea tikoloho.
