Cellulose ether pa zomatira matailosi opangidwa ndi simenti

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 wa simenti, imatha kusintha kwambiri mphamvu yolumikizana pakati pa zinthu zomwe zikuyang'anizana ndi gawo lapansi, ndipo imakhala ndi kukana kwabwino 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, kumamatira 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 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, 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) 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.

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 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" inanena momveka bwino 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).

Poyesa, timaganizira za HPMC, yomwe ndi ether yowonjezera.Kwa HPMC, imafunika kuyamwa pang'ono kuti iwonetsetse kusungunuka kwake m'madzi ndi kufalikira kwake.Tikudziwa kuti zomwe zili m'malo mwake zimatsimikiziranso kutentha kwa gel osakaniza a HPMC, ndiko kuti, Zimatsimikizira malo ogwiritsira ntchito HPMC, kotero zomwe zili mugulu la HPMC zomwe zimagwiritsidwa ntchito nthawi zambiri zimapangidwira mkati mwazosiyana.Munjira iyi, momwe mungaphatikizire methoxy ndi hydroxypropoxy kuti mukwaniritse bwino zomwe zili mu kafukufuku wathu.Mkati mwamtundu wina, kuwonjezeka kwa magulu a methoxyl kudzatsogolera kutsika kwa mphamvu zokoka, pamene kuwonjezeka kwa magulu a hydroxypropoxyl kudzatsogolera kuwonjezeka kwa mphamvu yokoka.Pali zotsatira zofanana ndi maola otsegulira.
Kusintha kwa mphamvu zamakina pansi pa nthawi yotseguka kumagwirizana ndi kutentha kwabwino, komwe kumagwirizananso ndi kulimba kwa filimu ya cellulose ether yomwe tinakambirana mu Gawo 2. Zomwe methoxyl (DS) ndizokwera komanso hydroxypropoxyl. HPMC yokhala ndi zochepa (MS) imakhala ndi kulimba kwa filimuyo, koma idzakhudza kunyowa kwa dothi lonyowa pamtunda.