Zomatira matailosi ndi imodzi mwazinthu zazikulu zomwe zimagwiritsidwa ntchito pamatope apadera owuma pakadali pano.Uwu ndi mtundu wa simenti monga chinthu chachikulu cha simenti ndikuphatikizidwa ndi magulu ophatikizika, osunga madzi, othandizira mphamvu zoyambira, ufa wa latex ndi zina zowonjezera kapena organic.kusakaniza.Nthawi zambiri, zimangofunika kusakanikirana ndi madzi zikagwiritsidwa ntchito.Poyerekeza ndi matope wamba wa simenti, imatha kusintha kwambiri mphamvu yolumikizirana pakati pa zinthu zomwe zikuyang'anizana ndi gawo lapansi, imakhala ndi kukana bwino komanso imakhala ndi madzi abwino kwambiri komanso kukana kutentha.Ndipo ubwino wa amaundana-thaw mkombero kukana, makamaka ntchito muiike nyumba mkati ndi kunja khoma matailosi, matailosi pansi ndi zipangizo zina zokongoletsera, chimagwiritsidwa ntchito mkati ndi kunja makoma, pansi, mabafa, khitchini ndi zina zomangamanga malo zokongoletsera, panopa ndi Zomwe zimagwiritsidwa ntchito kwambiri ndi zida za ceramic matailosi.
Kawirikawiri tikamaweruza ntchito ya zomatira matailosi, sitimangoganizira za ntchito yake komanso mphamvu zotsutsana ndi kutsetsereka, komanso kumvetsera mphamvu zake zamakina ndi nthawi yotsegula.Cellulose ethermu matailosi zomatira osati kumakhudza rheological katundu za porcelain zomatira, monga ntchito yosalala, mpeni kumamatira, etc., komanso ali ndi chikoka champhamvu pa mawotchi zimatha matailosi zomatira.Chikoka pa nthawi yotsegula ya zomatira matailosi
Pamene emulsion ufa ndi mapadi etero kukhalapo mu chonyowa matope, deta ena amasonyeza kuti emulsion ufa ali wamphamvu kinetic mphamvu angagwirizanitse simenti hydration mankhwala, ndi mapadi efa alipo kwambiri mu interstitial madzimadzi, zomwe zimakhudza matope kukhuthala kwambiri ndi kuika nthawi.Kuthamanga kwapang'onopang'ono kwa cellulose ether ndikwapamwamba kuposa ufa wa emulsion, ndipo kuwonjezereka kwa cellulose ether pa mawonekedwe amatope kudzakhala kopindulitsa kupanga zomangira za haidrojeni pakati pa maziko apansi ndi cellulose ether.
Mumtondo wonyowa, madzi mumtondo amasanduka nthunzi, ndipo cellulose ether imapindula pamwamba, ndipo filimu idzapangidwa pamwamba pa matope mkati mwa mphindi 5, zomwe zidzachepetsa kuchepa kwa evaporation, monga madzi ochulukirapo. kuchotsedwa matope wandiweyani Mbali ya izo amasamukira ku woonda matope wosanjikiza, ndi filimu anapanga pachiyambi ndi pang'ono kusungunuka, ndi kusamuka kwa madzi adzabweretsa kwambiri mapadi etere kulemeretsa pa matope pamwamba.
Choncho, filimu mapangidwe mapadi efa padziko matope ali ndi chikoka chachikulu pa ntchito ya matope.
1) Filimu yopangidwa ndi yopyapyala kwambiri ndipo idzasungunuka kawiri, osakhoza kuchepetsa kutuluka kwa madzi ndikuchepetsa mphamvu.
2) Firimu yopangidwa ndi yochuluka kwambiri, kuchuluka kwa cellulose ether mu matope amadzimadzi am'madzi ndipamwamba, ndipo kukhuthala kwake kumakhala kwakukulu, kotero sikophweka kuthyola filimu yapamwamba pamene matayala aikidwa.
Zitha kuwoneka kuti mawonekedwe opanga mafilimu a cellulose ether amakhudza kwambiri nthawi yotseguka.Mtundu wa cellulose ether (HPMC, HEMC, MC, etc.) ndi digiri ya etherification (digiri yolowa m'malo) imakhudza mwachindunji mapangidwe a filimu a cellulose ether, ndi kuuma ndi kulimba kwa filimuyo.
Kuphatikiza pa kupereka zinthu zopindulitsa zomwe zatchulidwa pamwambapa, cellulose ether imachedwetsanso hydration kinetics ya simenti.Izi retarding zotsatira makamaka chifukwa adsorption wa cellulose ether mamolekyu pa magawo osiyanasiyana mchere mu dongosolo simenti kukhala hydrated, koma zambiri kulankhula, mgwirizano ndi kuti mapadi etere mamolekyu makamaka adsorbed pa madzi monga CSH ndi calcium hydroxide.Pa mankhwala mankhwala, kawirikawiri adsorbed pa choyambirira mchere gawo la clinker.Kuphatikiza apo, ether ya cellulose imachepetsa kusuntha kwa ayoni (Ca2+, SO42-, ...) mu pore yankho chifukwa cha kuchuluka kwa mamasukidwe a pore yankho, potero kuchedwetsanso njira ya hydration.
Viscosity ndi gawo lina lofunikira, lomwe limayimira mawonekedwe amankhwala a cellulose ether.Monga tafotokozera pamwambapa, kukhuthala kumakhudza makamaka mphamvu yosungira madzi komanso kumakhudza kwambiri kugwira ntchito kwa matope atsopano.Komabe, kafukufuku woyesera apeza kuti kukhuthala kwa cellulose ether sikungakhudze chilichonse pa simenti ya hydration kinetics.Kulemera kwa mamolekyulu kumakhala ndi zotsatira zochepa pa hydration, ndipo kusiyana kwakukulu pakati pa zolemetsa zosiyanasiyana zamagulu ndi 10min yokha.Chifukwa chake, kulemera kwa ma cell si chinthu chofunikira kwambiri chowongolera simenti ya hydration.
"Kugwiritsira ntchito Cellulose Ether mu Simenti-Based Dry-Mixed Mortar Products" inasonyeza kuti kuchepa kwa cellulose ether kumadalira kapangidwe kake ka mankhwala.Ndipo zomwe zimachitika kawirikawiri ndikuti kwa MHEC, kuchuluka kwa methylation kumapangitsa kuchepa kwapang'onopang'ono kwa cellulose ether.Kuonjezera apo, zotsatira zowonongeka za hydrophilic substitution (monga m'malo mwa HEC) zimakhala zamphamvu kuposa za hydrophobic substitution (monga m'malo mwa MH, MHEC, MHPC).Kuchepetsa mphamvu ya cellulose ether kumakhudzidwa makamaka ndi magawo awiri, mtundu ndi kuchuluka kwa magulu olowa m'malo.
Zoyeserera zamakina zidapezanso kuti zomwe zili m'malo mwake zimagwira ntchito yofunika kwambiri pakulimba kwamakina a zomatira matailosi.Kwa HPMC, gawo linalake loperekera limafunikira kuti zitsimikizire kusungunuka kwake kwamadzi komanso kufalikira kwamadzi.Zomwe zili m'malo mwake zimatsimikiziranso mphamvu ya HPMC.Kutentha kwa gel osakaniza kumatsimikiziranso malo ogwiritsira ntchito HPMC.Mkati mwamtundu wina, kuwonjezeka kwa magulu a methoxyl kudzabweretsa kutsika kwa mphamvu yokoka, pamene kuwonjezeka kwa magulu a hydroxypropoxyl kumabweretsa kuchepa kwa mphamvu yokoka.kukwera kachitidwe.Pali zotsatira zofanana ndi maola otsegulira.
Kusintha kwa mphamvu zamakina pansi pa nthawi yotseguka kumagwirizana ndi kutentha kwabwino.HPMC yokhala ndi methoxyl (DS) yapamwamba komanso yotsika ya hydroxypropoxyl (MS) imakhala ndi kulimba kwa filimuyo, koma ikhudza matope onyowa m'malo mwake.zinthu wetting katundu.
Nthawi yotumiza: Dec-12-2022