Zomatira matailosi opangidwa ndi simenti ndiye njira yayikulu kwambiri yogwiritsira ntchito matope apadera amakono owuma.Ndi mtundu wa organic kapena inorganic admixture ndi simenti monga chuma chachikulu simenti ndi kuwonjezeredwa ndi grading akaphatikiza, wothandizila madzi posungira, oyambirira mphamvu wothandizira ndi latex ufa.kusakaniza.Kawirikawiri, zimangofunika kusakaniza ndi madzi.Poyerekeza ndi matope wamba wa simenti, imatha kupititsa patsogolo kwambiri mgwirizano pakati pa zinthu zomwe zikuyang'anizana ndi gawo lapansi, ili ndi katundu wabwino wotsutsa komanso imakhala ndi madzi abwino kwambiri komanso kukana kutentha.Amagwiritsidwanso ntchito kukongoletsa mkati ndi kunja kwa khoma matailosi, matailosi pansi ndi zipangizo zina zokongoletsera.Amagwiritsidwa ntchito kwambiri pokongoletsera makoma amkati ndi kunja, pansi, zipinda zosambira, khitchini, ndi zina zotero. Ndiwo matayala omwe amagwiritsidwa ntchito kwambiri.Zomangira.
Kawirikawiri, tikamaweruza ntchito yomatira matailosi, tiyenera kumvetsera mphamvu zake zamakina ndi nthawi yotsegulira kuwonjezera pa ntchito yake yogwira ntchito komanso mphamvu yotsutsa-kutsetsereka.Kuphatikiza pa kukhudza mphamvu ya rheological ya mphira wa porcelain, monga kusalala kwa ntchito, mkhalidwe wa mpeni womata, ndi zina zotero, ether ya cellulose imakhala ndi chikoka champhamvu pamakina a zomatira matailosi.
1. Nthawi yotsegula
LitiRedispersible polima ufandicellulose etherkukhala mu matope chonyowa, zitsanzo zina deta zimasonyeza kuti ufa mphira ali wamphamvu kinetic mphamvu Ufumuyo simenti hydration mankhwala, ndi mapadi efa zambiri alipo mu interstitial madzimadzi, zomwe zimakhudza kwambiri.Kukhuthala ndi nthawi yoyika matope.Kuchulukana kwapamtunda kwa cellulose ether ndikokulirapo kuposa ufa wa raba, ndipo kulemedwa kwa cellulose ether kwambiri pamawonekedwe amatope kumapindulitsa kupanga chomangira cha haidrojeni pakati pa maziko apansi ndi cellulose ether.
Mumtondo wonyowa, madzi mumtondo amasanduka nthunzi, ether ya cellulose imapangidwa pamwamba, ndipo filimu imapangidwa pamwamba pa matope mkati mwa mphindi 5, zomwe zimachepetsa kutuluka kwa nthunzi wotsatira, pamene madzi ambiri amakhala ochuluka kuchokera ku matope. matope.Gawo la kusamuka kupita ku gawo locheperako la matope osanjikiza, kutsegula koyamba kwa nembanemba kumasungunuka pang'ono, ndipo kusamuka kwamadzi kudzabweretsa ether yochulukirapo pamwamba pa matope.
Mapangidwe a filimu a cellulose ether pamwamba pa matope amakhudza kwambiri ntchito ya matope:
Choyamba, filimu yopangidwa ndi yopyapyala kwambiri, idzasungunuka kawiri, sangathe kuchepetsa kutuluka kwa madzi, kuchepetsa mphamvu.
Chachiwiri, filimu yopangidwa ndi yokhuthala kwambiri, kuchuluka kwa cellulose ether mumatope amadzimadzi am'madzi kumakhala kwakukulu, komanso mamasukidwe ake ndi akulu.Pamene matailosi amaikidwa, sikophweka kuswa filimu yapamwamba.
Kuchokera pa izi, zimamveka kuti filimu yomwe imapanga zinthu za cellulose ether imakhala ndi chikoka chachikulu pa nthawi yotsegulira.Mtundu wa cellulose ether (HPMC,Mtengo HEMC, MC, etc.) ndi digiri ya etherification (degree of substitution) zimakhudza mwachindunji mapangidwe a filimu a cellulose ether, ndi kuuma ndi kulimba kwa filimuyo.
2, mphamvu
Kuwonjezera pa kupereka zinthu zosiyanasiyana zopindulitsa zomwe zafotokozedwa pamwambapa kumatope, cellulose ether imalepheretsa hydration kinetics ya simenti.Kuchedwetsa kumeneku kumachitika makamaka chifukwa cha ma adsorption a cellulose ether mamolekyulu pamagawo osiyanasiyana amchere mu dongosolo la simenti ya hydrated, koma nthawi zambiri, mamolekyu a cellulose ether amakhala makamaka adsorbed pamadzi monga CSH ndi calcium hydroxide.Pa mankhwala mankhwala, kawirikawiri adsorbed pa choyambirira mchere gawo la clinker.Kuphatikiza apo, chifukwa chakuwonjezeka kwa kukhuthala kwa pore yankho, cellulose ether imachepetsa kuyenda kwa ayoni (Ca2+, SO42-, ...) mu pore yankho, potero kuchedwetsanso njira ya hydration.
Viscosity ndi gawo lina lofunikira lomwe limayimira mankhwala a cellulose ethers.Monga tafotokozera pamwambapa, kukhuthala kumakhudza makamaka mphamvu yosungira madzi komanso kumakhudza kwambiri kugwira ntchito kwa matope atsopano.Komabe, kafukufuku experimental apeza kuti mamasukidwe akayendedwe a mapadi efa pafupifupi alibe mphamvu pa hydration kinetics wa simenti.Kulemera kwa mamolekyu kumakhala ndi zotsatira zochepa pa hydration, ndipo kusiyana kwakukulu pakati pa zolemera zosiyana za maselo ndi 10 min.Chifukwa chake, kulemera kwa mamolekyulu si gawo lofunikira pakuwongolera simenti ya simenti.
"Kugwiritsira ntchito Cellulose Ether mu Cement-Based Dry-Mixed Mortar Products" imanena momveka bwino kuti kuchepa kwa cellulose ether kumadalira kapangidwe kake ka mankhwala.Zomwe zafotokozedwa mwachidule ndikuti kwa MHEC, kukwezeka kwa methylation, kumachepetsa kuchepa kwa cellulose ether.Kuonjezera apo, ma hydrophilic substitutions (monga m'malo mwa HEC) ndi opondereza kwambiri kuposa ma hydrophobic (monga m'malo mwa MH, MHEC, MHPC).Kuchepetsa mphamvu ya cellulose ether imakhudzidwa makamaka ndi magawo awiri amtundu ndi kuchuluka kwa gulu lolowa m'malo.
Zoyeserera zathu zamakina zidapezanso kuti zomwe zili m'malo mwake zimagwira ntchito yofunika kwambiri pakulimba kwamakina a zomatira matailosi.Tidawunika momwe HPMC imagwirira ntchito ndi magawo osiyanasiyana olowa m'malo mwa zomatira matailosi, ndikuyesa awiriawiri a cellulose ether ndi magulu osiyanasiyana pansi pazikhalidwe zosiyanasiyana zochiritsira.Chikoka cha makina a zomatira matailosi, Chithunzi 2 ndi Chithunzi 3 ndi zotsatira za kusintha kwa zinthu za methoxy (DS) ndi hydroxypropoxy (MS) zomwe zili pa mphamvu yokoka ya zomatira za matailosi kutentha kutentha.
Chithunzi 2
Chithunzi 3
Mu mayeso, timaganiziraHydroxypropyl methyl cellulose (HPMC), yomwe ndi ether yovuta.Chifukwa chake, tiyenera kuphatikiza ziwerengero ziwirizo.Kwa HPMC, timafunikira zoperekera kuti zitsimikizire kusungunuka kwamadzi komanso kufalikira kwamadzi.Timadziwa zomwe zili m'malo mwake.Imatsimikiziranso kutentha kwa gel osakaniza a HPMC, komwe kumatsimikizira malo omwe HPMC imagwiritsidwa ntchito.Chifukwa chake, zomwe zili mu HPMC yomwe imagwiritsidwa ntchito kwambiri imapangidwanso mosiyanasiyana.Momwe mungaphatikizire magulu a methoxy ndi hydroxypropoxy mumtundu uwu Kuti tipeze zotsatira zabwino ndi zomwe timaphunzira.Chithunzi 2 chikuwonetsa kuti mkati mwamtundu wina, kuwonjezeka kwa methoxyl kudzabweretsa kutsika kwa mphamvu yokoka, pamene hydroxypropoxyl idzawonjezeka ndipo mphamvu yokoka idzawonjezeka.Kwa nthawi yotseguka, pali zotsatira zofanana.
Nthawi yotumiza: Dec-18-2018