Zomatira zomatira za simenti zokhala ndi simenti ndiye njira yayikulu kwambiri yophatikizira matope owuma, omwe ndi mtundu wa simenti ngati chinthu chachikulu chopangira simenti ndikuphatikizidwa ndi kaphatikizidwe, wosungira madzi, woyambitsa mphamvu, ufa wa latex ndi zina organic kapena organic. zosakaniza. Nthawi zambiri amagwiritsidwa ntchito ndi kusanganikirana kwamadzi, poyerekeza ndi matope wamba simenti, amatha kusintha kwambiri mphamvu yolumikizirana pakati pa zinthu zomaliza ndi zinthu zapansi, ali ndi anti-slip yabwino ndipo ali ndi kukana kwambiri kwamadzi, kukana kutentha ndi ubwino wozizira wachisanu, womwe umagwiritsidwa ntchito kwambiri. kwa kumata matailosi amkati ndi kunja kwa khoma, matailosi apansi ndi zinthu zina zokongoletsera, Amagwiritsidwa ntchito kwambiri pokongoletsa makoma, pansi, zimbudzi, makhitchini ndi nyumba zina. Ndizinthu zomwe zimagwiritsidwa ntchito kwambiri ndi matayala a ceramic.
Kawirikawiri tikamaweruza ntchito ya zomatira za ceramic matailosi, kuwonjezera pa kumvetsera ntchito yake yogwiritsira ntchito, mphamvu yotsutsa-kutsetsereka, komanso kulabadira mphamvu zake zamakina ndi nthawi yotseguka. Cellulose efa pa ceramic matailosi zomatira kuwonjezera bwanji rheological katundu zadothi guluu, monga ntchito yosalala ntchito, ndodo mpeni mkhalidwe, komanso pa makina zimatha ceramic matailosi zomatira ali ndi chikoka champhamvu.
1. Tsegulaninthawi
Pamene ufa mphira ndi mapadi etero kukhalapo mu chonyowa matope, zitsanzo zina deta zikusonyeza kuti mphira ufa ali wamphamvu kinetic mphamvu kutsatira simenti mankhwala hydration, ndi mapadi efa alipo kwambiri mu kusiyana madzimadzi, zomwe zimakhudza mamasukidwe akayendedwe ndi kuika nthawi ya matope. Zambiri. Kuchulukana kwapang'onopang'ono kwa cellulose ether ndikokulirapo kuposa ufa wa mphira, ndipo kukhathamiritsa kwa cellulose ether kwambiri pamawonekedwe amatope kumapindulitsa kupanga zomangira za haidrojeni pakati pa ndege yoyambira ndi cellulose ether.
Kuchuluka kwa chinyezi kuchokera mumatope onyowa, matope, cellulose ether pamtunda wolemerera, mphindi 5 zimatha kupanga nembanemba pamwamba pa matope, kuchepetsa kuchuluka kwa evaporation yotsatila, ndi madzi ambiri kuchokera ku slurry wandiweyani. kusamukira ku matope wosanjikiza ndi woonda, lotseguka mfundo mbali kusungunuka pamene mapangidwe koyamba nembanemba, kusamuka kwa madzi kungabweretse kwambiri kulemeretsa mapadi efa mu matope pamwamba.
Mapangidwe a filimu ya cellulose ether pamwamba pa matope amakhudza kwambiri mphamvu ya matope:
Choyamba, filimu yopangidwa ndi yopyapyala kwambiri, idzasungunuka kawiri, osakhoza kuchepetsa kutuluka kwa madzi, kuchepetsa mphamvu.
Awiri, mapangidwe filimu kwambiri wandiweyani, mapadi efa mu matope kusiyana madzi ndende ndi mkulu, mamasukidwe akayendedwe, pamene ceramic matailosi phala n'kosavuta kuswa padziko filimu.
Zitha kuwoneka kuti filimu yomwe imapanga ntchito ya cellulose ether imakhudza kwambiri nthawi yotsegulira. Mtundu wa cellulose ether (HPMC, HEMC, MC, etc.) ndi digiri ya etherification (degree of substitution) zimakhudza mwachindunji filimu yomwe imapanga ntchito ya cellulose ether, kuuma ndi kulimba kwa filimuyo.
2, mphamvu yokoka
Ma cellulose ether sikuti amangopatsa matope ndi zinthu zonse zomwe zili pamwambazi, komanso amachedwetsa ma hydration kinetics a simenti. Izi mochedwa zotsatira makamaka chifukwa adsorption wa cellulose ether mamolekyu pa magawo osiyanasiyana mchere mu dongosolo simenti kukhala hydrated, koma ambiri amavomereza kuti mapadi etha mamolekyu makamaka adsorbed pa mankhwala hydration monga CSH ndi calcium hydroxide, ndipo kawirikawiri adsorbed pa. gawo loyamba la mineral la clinker. Kuphatikiza apo, ether ya cellulose imachepetsa ayoni (Ca2+, SO42-, ...) chifukwa chakuchulukira kwamphamvu kwa pore solution. Ntchito mu pore solution, yomwe imalepheretsanso hydration.
Viscosity ndi gawo lina lofunikira, lomwe limayimira mankhwala a cellulose ether. Monga tanena kale, mamasukidwe akayendedwe makamaka zimakhudza mphamvu posungira madzi, komanso zimakhudza kwambiri workability wa matope atsopano. Komabe, kafukufuku experimental anapeza kuti mamasukidwe akayendedwe a mapadi ether anali pafupifupi alibe mphamvu pa hydration kinetics wa simenti. Kulemera kwa mamolekyu kulibe mphamvu pang'ono pa hydration, ndipo kusiyana kwakukulu pakati pa zolemera zosiyana za maselo ndi 10min yokha. Chifukwa chake, kulemera kwa mamolekyulu sizinthu zazikulu zowongolera simenti ya hydration.
"Selulosi ether mu simenti zochokera youma Mix matope mankhwala mu ntchito" anasonyeza bwino kuti mapadi ether kuchedwa zimadalira kapangidwe ake mankhwala. Zomwe zimachitika ndizoti kwa MHEC, kuchuluka kwa methylation kumakhala kocheperako, kumachepetsa kuchepa kwa cellulose ether. Kuonjezera apo, hydrophilic substitution (monga m'malo mwa HEC) imakhala ndi mphamvu yowonongeka kuposa hydrophobic substitution (monga m'malo mwa MH, MHEC ndi MHPC). Kuchepetsa mphamvu ya cellulose ether kumakhudzidwa makamaka ndi magawo awiri amtundu ndi kuchuluka kwa magulu olowetsedwa.
Kuyesera kwathu mwadongosolo kudapezanso kuti zomwe zili m'malo mwake zimagwira ntchito yofunika kwambiri pakulimba kwamakina a zomatira za matailosi a ceramic. Tidawunika momwe HPMC imagwirira ntchito m'malo osiyanasiyana pazomatira matailosi a ceramic, ndikuyesa mphamvu ya cellulose ether yomwe ili ndi magulu osiyanasiyana pamikhalidwe yosiyanasiyana yochiritsa pamakina omatira matailosi a ceramic. Chikoka cha zili DS ndi MS pa kujambula mphamvu ya ceramic matailosi zomatira pa firiji.
HPMC ndi gulu la ether, kotero kuti tiyike ziwerengero ziwirizi pamodzi, kwa HPMC, pakufunika kukhala ndi mlingo wokwanira, kuti zitsimikizire kusungunuka kwake kwa madzi ndi kufalikira, tikudziwa kuti zomwe zili m'malo mwake zimatsimikiziranso kutentha kwa gel osakaniza a HPMC. , zomwe ndi kudziwa ntchito HPMC chilengedwe, Mwa njira iyi, zili gulu la HPMC zakonzedwa mu osiyanasiyana. Munjira iyi, momwe mungaphatikizire methoxy ndi hydroxypropoxy kuti mukwaniritse bwino ndi zomwe zili mu phunziro lathu. Pazigawo zina, kuwonjezeka kwa zinthu za methoxy kumabweretsa kutsika kwa mphamvu yokoka, pamene kuwonjezeka kwa hydroxypropoxy kumabweretsa kukwera kwa mphamvu yokoka. Pali zotsatira zofanana pa nthawi yotsegula.
Nthawi yotumiza: Dec-20-2021