I-desulfurization gypsum iyigesi yomoya ekhiqizwa ukushiswa kwamafutha aqukethe isibabule (amalahle, uphethiloli), imfucuza eqinile yezimboni ekhiqizwa ngesikhathi senqubo yokuhlanzwa kwe-desulfurization, kanye ne-hemihydrate gypsum (ifomula yamakhemikhali i-CaSO4· 0.5H2O), ukusebenza kufana nokwe-gypsum yokwakha yemvelo. Ngakho-ke, kunezifundo eziningi kanye nezicelo zokusebenzisa i-desulfurized gypsum esikhundleni se-gypsum yemvelo ukukhiqiza izinto zokuzilinganisa. Izingxube ze-polymer ze-organic ezifana ne-ejenti yokunciphisa amanzi, i-ejenti yokugcina amanzi kanye ne-retarder ziyizingxenye ezibalulekile zokusebenza ekwakhiweni kwezinto zodaka ezizilinganisayo. Ukusebenzisana kanye nendlela yokusebenza kwalokhu okubili nezinto zodaka kuyizinkinga ezifanele ukunakwa. Ngenxa yezici zenqubo yokwakheka, ubuncane be-gypsum e-desulfurized buncane (usayizi wezinhlayiya usatshalaliswa kakhulu phakathi kuka-40 no-60 μm), futhi ukuhlelwa kwempuphu akunangqondo, ngakho-ke izakhiwo ze-rheological ze-desulfurized gypsum azinhle, futhi ukungcola kodaka okulungiselelwe yiyo kuvame ukuba lula. Ukuhlukaniswa, ukuhlukaniswa kanye nokopha kwenzeka. I-cellulose ether iyindlela evame ukusetshenziswa kakhulu yokuxuba izinto ezifakwe ku-mortar, futhi ukusetshenziswa kwayo okuhlangene ne-ejenti yokunciphisa amanzi kuyisiqinisekiso esibalulekile sokufezwa kokusebenza okuphelele kwezinto ezizilinganisayo ezisekelwe ku-gypsum ezifakwe ku-sulfur ezifana nokusebenza kokwakha kanye nokusebenza komshini nokuqina kamuva.
Kuleli phepha, inani lokugeleza lisetshenziswa njengenkomba yokulawula (izinga lokusabalalisa elingu-145 mm±5 mm), kugxilwe emthonjeni wokuqukethwe kwe-cellulose ether kanye nesisindo sama-molecule (inani le-viscosity) ekusetshenzisweni kwamanzi kwezinto ezizilinganisayo ezisekelwe ku-gypsum ezi-desulfurized, ukulahleka kokugeleza ngokuhamba kwesikhathi, kanye nokujiya. Umthetho wethonya lezakhiwo eziyisisekelo njengesikhathi kanye nezakhiwo zokuqala zemishini; ngesikhathi esifanayo, hlola umthetho wethonya le-cellulose ether ekukhululweni kokushisa kanye nezinga lokukhululwa kokushisa kwe-gypsum hydration e-desulfurized, hlaziya ithonya layo enqubweni yokugeleza kwe-gypsum e-desulfurized, bese uxoxa ngalolu hlobo lokuxuba. Ukuhambisana nohlelo lwe-gypsum gelling olu-desulfurization.
1. Izinto zokusetshenziswa kanye nezindlela zokuhlola
1.1 Izinto zokusetshenziswa
Impuphu ye-Gypsum: impuphu ye-gypsum ekhishwe i-sulfur ekhiqizwa yinkampani eTangshan, ukwakheka okuyinhloko kwamaminerali yi-hemihydrate gypsum, ukwakheka kwayo kwamakhemikhali kuboniswe kuThebula 1, kanti izakhiwo zayo zomzimba ziboniswe kuThebula 2.
isithombe
isithombe
Izingxube zifaka: i-cellulose ether (i-hydroxypropyl methylcellulose, i-HPMC ngamafuphi); i-superplasticizer WR; i-defoamer B-1; i-EVA redispersible latex powder S-05, konke okutholakala kwezentengiso.
Isiyonke: isihlabathi somfula semvelo, isihlabathi esihle esenziwe ngokuzenzela esihlungiwe ngesihlungo esingu-0.6 mm.
1.2 Indlela yokuhlola
I-gypsum yokuhlanzisisa okulungisiwe: isihlabathi: amanzi = 1:0.5:0.45, inani elifanele lezinye izingxube, ukugeleza njengenkomba yokulawula (ukwanda okungu-145 mm ± 5 mm), ngokulungisa ukusetshenziswa kwamanzi, ngokulandelana kuxutshwe nezinto zokwakha ubumba (i-gypsum yokuhlanzisisa ubumba + ubumba) 0, 0.5‰, 1.0‰, 2.0‰, 3.0‰ i-cellulose ether (HPMC-20,000); qhubeka ulungise umthamo we-cellulose ether ku-1‰, khetha ama-ether e-hydroxypropyl methylcellulose ethers e-HPMC-20,000, HPMC-40,000, HPMC-75,000, kanye ne-HPMC-100,000 anesisindo sama-molecule ahlukene (izinombolo ezihambisanayo yi-H2, H4, H7.5, kanye ne-H10 ngokulandelana), ukuze ufunde umthamo kanye nesisindo sama-molecule (inani le-viscosity) le-cellulose ether. Umthelela wezinguquko ezakhiweni ze-gypsum-based self-leveling mortar, kanye nethonya lalawa amabili ekugelezeni, isikhathi sokusetha kanye nezakhiwo zokuqala ze-mechanical zengxube ye-gypsum self-leveling mortar exoxwe ngayo. Indlela yokuhlola ethile yenziwa ngokuhambisana nezidingo ze-GB/T 17669.3-1999 “Ukunqunywa Kwezakhiwo Zemishini Ze-Gypsum Yokwakha”.
Ukuhlolwa kokushisa komswakama kwenziwa kusetshenziswa isampula engenalutho ye-gypsum ekhishwe i-sulfur kanye namasampula anokuqukethwe kwe-cellulose ether okungu-0.5‰ no-3‰, ngokulandelana, futhi ithuluzi elisetshenziswayo liyisihloli sokushisa komswakama sohlobo lwe-TA-AIR.
2. Imiphumela nokuhlaziywa
2.1 Umphumela wokuqukethwe kwe-cellulose ether ezimpahleni eziyisisekelo ze-mortar
Ngokwanda kokuqukethwe, ukusebenza kahle kanye nokuhlangana kwe-mortar kuthuthuka kakhulu, ukulahleka kokugeleza ngokuhamba kwesikhathi kuncishiswe kakhulu, futhi ukusebenza kokwakhiwa kuhle kakhulu, futhi i-mortar eqinile ayinayo into yokuhlukanisa, futhi ukushelela kobuso, ukushelela kanye nobuhle kuthuthukiswe kakhulu. Ngesikhathi esifanayo, ukusetshenziswa kwamanzi kwe-mortar ukuze kufezwe ukugeleza okufanayo kukhuphuke kakhulu. Ku-5‰, ukusetshenziswa kwamanzi kukhuphuke ngo-102%, kanti isikhathi sokugcina sokusetha sandiswa ngemizuzu eyi-100, okwakuphindwe izikhathi ezingu-2.5 kunesampula engenalutho. Izakhiwo zokuqala zemishini ze-mortar zehle kakhulu ngokwanda kokuqukethwe kwe-cellulose ether. Lapho okuqukethwe kwe-cellulose ether kungu-5‰, amandla okuguquguquka kwamahora angama-24 kanye namandla okucindezela ehle afinyelela ku-18.75% kanye no-11.29% wesampula engenalutho ngokulandelana. Amandla okucindezela angama-39.47% kanye no-23.45% wesampula engenalutho ngokulandelana. Kuyaphawuleka ukuthi ngokwanda kwenani le-ejenti yokugcina amanzi, ubukhulu be-mortar bunciphile kakhulu, kusukela ku-2069 kg/m3 ku-0 kuya ku-1747 kg/m3 ku-5‰, ukwehla ngo-15.56%. Ubuningi be-mortar buyancipha futhi i-porosity iyanda, okungenye yezizathu zokwehla okusobala kwezakhiwo ze-mortar.
I-cellulose ether iyi-polymer engeyona i-ionic. Amaqembu e-hydroxyl ku-cellulose ether chain kanye nama-athomu e-oxygen ku-ether bond angahlangana nama-molecule amanzi ukuze akhe izibopho ze-hydrogen, aguqule amanzi akhululekile abe ngamanzi aboshwe, ngaleyo ndlela adlale indima ekugcinweni kwamanzi. Ngokwe-Macroscopically Kubonakaliswa njengokwanda kokuhlangana kwe-slurry [5]. Ukwanda kwe-slurry viscosity ngeke nje kwandise ukusetshenziswa kwamanzi, kodwa futhi ne-cellulose ether encibilikisiwe izonamathela ebusweni bezinhlayiya ze-gypsum, kuvimbele ukusabela kwe-hydration futhi kwandise isikhathi sokusetha; ngesikhathi senqubo yokuxuba, kuzokwethulwa inani elikhulu lama-bubble omoya. Kuzokwakheka ama-voids njengoba i-mortar iqina, ekugcineni kunciphise amandla e-mortar. Uma sicabangela ngokuphelele ukusetshenziswa kwamanzi ohlangothini olulodwa kwengxube ye-mortar, ukusebenza kokwakhiwa, isikhathi sokusetha kanye nezakhiwo zemishini, kanye nokuqina kamuva, njll., okuqukethwe kwe-cellulose ether ku-desulfurized gypsum-based self-leveling mortar akufanele kudlule i-1‰.
2.2 Umphumela wesisindo sama-molecule se-cellulose ether ekusebenzeni kodaka
Ngokuvamile, uma i-viscosity iphakeme futhi ubuncane be-cellulose ether buphezulu, kulapho ukugcinwa kwamanzi kuthuthuka khona futhi kwandise amandla okubopha. Ukusebenza kuzothinteka kabi. Ngakho-ke, ithonya lama-cellulose ethers ezisindo ezahlukene zama-molecule ezimpahleni eziyisisekelo zezinto zobumba ezizilinganisayo ezisekelwe ku-gypsum lahlolwa kabanzi. Isidingo samanzi sobumba sanda ngezinga elithile, kodwa asizange sibe nomthelela osobala esikhathini sokusetha kanye nokugeleza. Ngesikhathi esifanayo, amandla okuguquguquka nokucindezela obumba ezifundazweni ezahlukene abonise umkhuba wokwehla, kodwa ukwehla kwakuncane kakhulu kunethonya lokuqukethwe kwe-cellulose ether ezimpahleni zomshini. Ngamafuphi, ukwanda kwesisindo sama-molecule se-cellulose ether akunawo umphumela osobala ekusebenzeni kwezingxube zobumba. Uma kucatshangelwa ukulula kokwakhiwa, i-cellulose ether ene-viscosity ephansi kanye ne-cellulose ether enesisindo esincane kufanele ikhethwe njengezinto zobumba ezizilinganisayo ezisekelwe ku-gypsum ezisusiwe i-sulfurized.
2.3 Umphumela we-cellulose ether ekushiseni kokumuncwa kwe-gypsum ekhishwe i-sulfur
Ngokukhula kokuqukethwe kwe-cellulose ether, inani eliphakeme kakhulu lokumuncwa kwe-gypsum e-desulfurized lancipha kancane kancane, futhi isikhathi sesikhundla esiphezulu sabambezeleka kancane, kuyilapho ukushisa kwe-exothermic kokumuncwa kwe-hydration kwehla, kodwa hhayi ngokusobala. Lokhu kukhombisa ukuthi i-cellulose ether ingalibazisa izinga lokumuncwa kanye nezinga lokumuncwa kwe-gypsum e-desulfurized ngezinga elithile, ngakho-ke umthamo akufanele ube mkhulu kakhulu, futhi kufanele ulawulwe ngaphakathi kwe-1‰. Kungabonakala ukuthi ifilimu ye-colloidal eyakhiwe ngemuva kokuhlangana kwe-cellulose ether namanzi inamathela ebusweni bezinhlayiya ze-gypsum e-desulfurized, okunciphisa izinga lokumuncwa kwe-gypsum ngaphambi kwamahora ama-2. Ngesikhathi esifanayo, ukugcinwa kwamanzi kanye nemiphumela yayo yokuqina okuyingqayizivele kubambezela ukuhwamuka kwamanzi e-slurry futhi ukuhlakazeka kuyasiza ekumuncweni okuqhubekayo kwe-gypsum e-desulfurized esigabeni esilandelayo. Ngamafuphi, lapho umthamo ofanele ulawulwa, i-cellulose ether inethonya elilinganiselwe esilinganisweni sokumuncwa kanye nezinga lokumuncwa kwe-gypsum e-desulfurized ngokwayo. Ngesikhathi esifanayo, ukwanda kokuqukethwe kwe-cellulose ether kanye nesisindo sama-molecule kuzokwandisa kakhulu i-viscosity ye-slurry futhi kubonise ukusebenza okuhle kakhulu kokugcinwa kwamanzi. Ukuze kuqinisekiswe ukugeleza kwe-drywall ye-gypsum e-desulfurized self-leveling, ukusetshenziswa kwamanzi kuzokwanda kakhulu, okubangelwa isikhathi eside sokusetha kwe-drywall. Isizathu esiyinhloko sokwehla kwezakhiwo zemishini.
3. Isiphetho
(1) Uma kusetshenziswa uketshezi njengenkomba yokulawula, ngokwanda kokuqukethwe kwe-cellulose ether, isikhathi sokubeka kwe-desulfurized gypsum-based self-leveling mortar sihlala isikhathi eside kakhulu, futhi izakhiwo zemishini zincishiswa kakhulu; uma kuqhathaniswa nokuqukethwe, isisindo sama-molecule se-cellulose ether Ukwanda akunawo umthelela omkhulu ezimpahleni ezingenhla ze-mortar. Uma kucatshangelwa ngokuphelele, i-cellulose ether kufanele ikhethwe ngesisindo sama-molecule esincane (inani le-viscosity elingaphansi kwama-20 000 Pa·s), futhi umthamo kufanele ulawulwe ngaphakathi kwe-1‰ yezinto ezisimende.
(2) Imiphumela yokuhlolwa kokushisa komswakama kwe-gypsum ekhishwe i-sulfur ikhombisa ukuthi ngaphakathi kobubanzi balolu vivinyo, i-cellulose ether inethonya elilinganiselwe esilinganisweni somswakama kanye nenqubo yomswakama we-gypsum ekhishwe i-sulfur. Ukwanda kokusetshenziswa kwamanzi kanye nokwehla kobuningi bezinto kuyizizathu eziyinhloko zokwehla kwezakhiwo zemishini ze-mortar esuselwe ku-gypsum ekhishwe i-sulfur.
Isikhathi sokuthunyelwe: Meyi-08-2023