1 Mawu Oyamba
Zomatira zomatira za simenti pakali pano ndizomwe zimagwiritsidwa ntchito kwambiri pamatope osakanikirana owuma, omwe amapangidwa ndi simenti monga chinthu chachikulu cha simenti ndikuphatikizidwa ndi magulu ophatikizika, osungira madzi, othandizira mphamvu zoyambira, ufa wa latex ndi zina zowonjezera organic kapena organic. kusakaniza. Nthawi zambiri, zimangofunika kusakanikirana ndi madzi zikagwiritsidwa ntchito. Poyerekeza ndi matope wamba a simenti, imatha kusintha kwambiri mphamvu yolumikizana pakati pa zinthu zomwe zikuyang'anizana ndi gawo lapansi, ndipo imakhala ndi kukana bwino komanso kukana madzi ndi madzi. Amagwiritsidwa ntchito makamaka kuyika zinthu zokongoletsera monga kumanga mkati ndi kunja kwa khoma matailosi, matailosi pansi, etc. Amagwiritsidwa ntchito kwambiri mkati ndi kunja kwa makoma, pansi, zimbudzi, khitchini ndi malo ena okongoletsera nyumba. Pakali pano ndizomwe zimagwiritsidwa ntchito kwambiri ndi Tile bonding material.
Kawirikawiri tikamaweruza ntchito ya zomatira matailosi, sitimangoganizira za ntchito yake komanso mphamvu zotsutsana ndi kutsetsereka, komanso kumvetsera mphamvu zake zamakina ndi nthawi yotsegula. Cellulose ether mu zomatira matailosi osati zimakhudza rheological katundu za porcelain zomatira, monga ntchito yosalala, zomatira mpeni, etc., komanso ali ndi chikoka champhamvu pa makina zimatha zomatira matailosi.
2. Zomwe zimakhudza nthawi yotsegulira zomatira matailosi
Pamene ufa mphira ndi mapadi etero kukhalapo mu chonyowa matope, zitsanzo zina deta zimasonyeza kuti ufa mphira ali wamphamvu kinetic mphamvu angagwirizanitse simenti hydration mankhwala, ndi mapadi etero alipo kwambiri mu interstitial madzimadzi, zomwe zimakhudza kwambiri Mortar mamasukidwe akayendedwe ndi kuika nthawi. Kuchulukana kwapang'onopang'ono kwa cellulose ether ndikwapamwamba kuposa ufa wa mphira, ndipo kuchulukitsa kwa cellulose etha pamawonekedwe amatope kudzakhala kopindulitsa pakupanga zomangira za haidrojeni pakati pa maziko apansi ndi mapadi a cellulose.
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 mumatope ochuluka Mbali ina imasamukira kumtunda wochepa kwambiri wamatope, ndipo filimuyo yomwe inapangidwa pachiyambi imasungunuka pang'ono, ndipo kusamuka kwa madzi kudzabweretsa mapadi ambiri. onjezerani ether pamwamba pa matope.
Choncho, kupanga filimu ya cellulose ether pamwamba pa matope kumakhudza kwambiri ntchito ya matope. 1) Filimu yopangidwa ndi yowonda kwambiri ndipo idzasungunuka kawiri, zomwe sizingachepetse kutuluka kwa madzi ndikuchepetsa mphamvu. 2) Filimu yopangidwa ndi yochuluka kwambiri, kuchuluka kwa cellulose ether mumatope amadzimadzi amadzimadzi 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 ya cellulose ether, ndi kuuma ndi kulimba kwa filimuyo.
3. Chikoka pa mphamvu kujambula
Kuphatikiza pa kupereka zinthu zopindulitsa zomwe zatchulidwa pamwambapa, cellulose ether imachedwetsanso hydration kinetics ya simenti. Izi retarding zotsatira makamaka chifukwa adsorption wa cellulose etha mamolekyu pa magawo osiyanasiyana mchere mu dongosolo simenti kukhala hydrated, koma zambiri kulankhula, mgwirizano ndi kuti mapadi etero 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 njira ya pore 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 mamolekyu kumakhala ndi mphamvu zochepa pa hydration, ndipo kusiyana kwakukulu pakati pa zolemera zosiyana za maselo ndi 10min yokha. Chifukwa chake, kulemera kwa ma cell si chinthu chofunikira kwambiri chowongolera simenti ya hydration.
Kuchedwa kwa cellulose ether kumadalira kapangidwe kake ka mankhwala, ndipo kachitidwe kake kamatsimikizira kuti, kwa MHEC, kukwezeka kwa digiri ya methylation, 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.
Kuyesera kwathu mwadongosolo kudapezanso kuti zomwe zili m'malo mwake zimagwira ntchito yofunika kwambiri pakulimba kwamakina a zomatira zamatayilo. Tinawunika momwe HPMC imagwirira ntchito ndi magawo osiyanasiyana olowa m'malo mwa zomatira matailosi, ndikuyesa momwe ma cellulose ethers okhala ndi magulu osiyanasiyana amachiritsira pazotsatira zamakina a zomatira matailosi.
M'mayeso, timaganizira za HPMC, yomwe ndi ether yowonjezera, kotero tiyenera kuyika zithunzi ziwiri pamodzi. Kwa HPMC, imafunika kuyamwa pang'ono kuti iwonetsetse kusungunuka kwake m'madzi ndi kufalikira kwake. Timadziwa zomwe zili m'malo mwake Zimatsimikiziranso kutentha kwa gel osakaniza HPMC, komwe kumatsimikiziranso malo ogwiritsira ntchito HPMC. Mwanjira iyi, zomwe zili m'gulu la HPMC zomwe zimagwiritsidwa ntchito nthawi zambiri zimayikidwanso m'magulu osiyanasiyana. Munjira iyi, momwe mungaphatikizire methoxy ndi hydroxypropoxy Kuti tikwaniritse zotsatira zabwino ndizomwe zili mu kafukufuku wathu. Chithunzi 2 chikuwonetsa kuti mkati mwamtundu wina, kuwonjezeka kwa magulu a methoxyl kudzatsogolera kutsika kwa mphamvu zokoka, pamene kuwonjezeka kwa magulu a hydroxypropoxyl kudzachititsa kuwonjezeka kwa mphamvu yokoka. . 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: Jan-09-2023