Kusankhidwa kwa mitundu yosiyanasiyana, ma viscosity osiyanasiyana, kukula kwa tinthu tating'onoting'ono, ma viscosity osiyanasiyana komanso kuwonjezeredwa kwa ma cellulose ethers kumakhalanso ndi zotsatira zosiyana pakusintha kwa matope owuma a ufa. Pakalipano, matope ambiri omanga ndi pulasitala sakhala ndi ntchito yabwino yosungira madzi, ndipo matope amadzi amalekanitsidwa pakangopita mphindi zochepa. Chifukwa chake ndikofunikira kwambiri kuwonjezera cellulose ether mumatope a simenti.
Mumatope osakaniza okonzeka, malinga ngati kanyumba kakang'ono ka cellulose ether kakhoza kusintha kwambiri ntchito ya matope onyowa, zikhoza kuwoneka kuti cellulose ether ndi chowonjezera chachikulu chomwe chimakhudza ntchito yomanga matope. “
Selulosi ether - mpweya-entraining zotsatira
Ma cellulose ether ali ndi mphamvu zodziwikiratu zopatsa mpweya pazinthu zatsopano zopangira simenti. Ma cellulose ether ali ndi magulu onse a hydrophilic (magulu a hydroxyl, magulu a ether) ndi magulu a hydrophobic (magulu a methyl, mphete za glucose), ndipo amapangidwa ndi surfactant ndi zochitika zapamtunda, motero amakhala ndi mphamvu yopatsa mpweya. Mphamvu ya mpweya wa cellulose ether idzatulutsa "mpira", yomwe ingathe kupititsa patsogolo ntchito ya zipangizo zatsopano zosakanikirana, monga kuonjezera pulasitiki ndi kusalala kwa matope panthawi ya ntchito, zomwe zimathandiza kuti matope afalikire. ; idzawonjezeranso kutulutsa kwamatope, kuchepetsa mtengo wopangira matope; koma idzawonjezera porosity ya zinthu zowumitsidwa ndikuchepetsa mphamvu zake zamakina monga mphamvu ndi zotanuka modulus.
Monga surfactant, cellulose ether imakhalanso ndi kunyowetsa kapena kudzoza pa tinthu tating'ono ta simenti, zomwe zimawonjezera kusungunuka kwa zinthu zopangira simenti pamodzi ndi zotsatira zake za mpweya, koma kukhuthala kwake kudzachepetsa kuchepa kwa madzi. Zotsatira za fluidity ndi kuphatikiza kwa plasticizing ndi thickening zotsatira. Nthawi zambiri, pamene zomwe zili mu cellulose ether ndizochepa kwambiri, ntchito yaikulu ndi pulasitiki kapena kuchepetsa madzi; pamene zili pamwamba, kukhuthala kwa cellulose ether kumawonjezeka mofulumira, ndipo zotsatira zake zolowetsa mpweya zimakhala zodzaza. Chifukwa chake zimawoneka ngati kukhuthala kapena kuwonjezeka kwa kufunikira kwa madzi.
Selulosi Ether - Kuchedwa
Ma cellulose ether adzatalikitsa nthawi yokhazikitsa phala la simenti kapena matope, ndikuchedwa ndi hydration kinetics ya simenti, yomwe imapindulitsa kupititsa patsogolo nthawi yogwira ntchito yazinthu zatsopano zosakanikirana, kuwongolera kusasinthika kwamatope ndi kutayika kwa konkriti pakapita nthawi, koma mwina komanso kuchedwetsa ntchito yomanga.
Cellulose ether - kusunga madzi
Kusungirako madzi ndi ntchito yofunikira ya methyl cellulose ether, komanso ndikuchitanso komwe opanga matope ambiri am'nyumba, makamaka omwe ali kumadera akum'mwera komwe kumatentha kwambiri, amalabadira.
Popanga zida zomangira, makamaka matope a ufa wowuma, ether ya cellulose imagwira ntchito yosasinthika, makamaka popanga matope apadera (matope osinthidwa), ndi gawo lofunikira komanso lofunikira.
Kukhuthala, mlingo, kutentha kozungulira ndi kapangidwe ka cellulose ether zimakhudza kwambiri momwe madzi amasungira. Pansi pazikhalidwe zomwezo, kuchulukira kwamphamvu kwa cellulose ether, kumapangitsa kuti madzi asungidwe bwino; Kuchuluka kwa mlingo, kumapangitsa kuti madzi asungidwe bwino. Nthawi zambiri, kachulukidwe kakang'ono ka cellulose ether kumatha kusintha kwambiri kusungidwa kwamadzi mumatope. Mlingo ukafika wina wake Pamene mlingo wa kusunga madzi ukuwonjezeka, chizolowezi chosungira madzi chimachepetsa; kutentha kozungulira kumakwera, kusungidwa kwa madzi kwa cellulose ether nthawi zambiri kumachepa, koma ma ether ena osinthidwa a cellulose amakhalanso ndi madzi osungira bwino pansi pa kutentha kwakukulu; ulusi wokhala ndi magawo otsika olowa m'malo a Vegan ether amakhala ndi ntchito yabwino yosungira madzi.
Gulu la hydroxyl pa molekyulu ya cellulose ether ndi atomu ya okosijeni pa mgwirizano wa ether udzalumikizana ndi molekyulu yamadzi kuti apange mgwirizano wa haidrojeni, kutembenuza madzi aulere kukhala madzi omangika, potero akugwira ntchito yabwino yosungira madzi; madzi molekyulu ndi mapalo etero maselo unyolo Interdiffusion amalola mamolekyu madzi kulowa mkati mwa cellulose etere macromolecular unyolo ndi pansi amphamvu zomangira mphamvu, potero kupanga madzi aulere, madzi omangika, ndi kuwongolera kusunga madzi a simenti slurry; cellulose ether imathandizira slurry yatsopano ya simenti The rheological properties, porous network structure ndi osmotic pressure kapena kupanga filimu ya cellulose ether kumalepheretsa kufalikira kwa madzi.
Ma cellulose ethers - thickening ndi thixotropy
Cellulose ether imapangitsa kuti matope amadzimadzi azikhala ndi kukhuthala kwabwino kwambiri, komwe kumatha kukulitsa luso lolumikizana pakati pa matope onyowa ndi gawo loyambira, ndikuwongolera magwiridwe antchito a matope. Amagwiritsidwa ntchito kwambiri popaka matope, matope omangira njerwa ndi njira yotchinjiriza kunja. The thickening zotsatira za mapadi efa kungathenso kuonjezera odana ndi kubalalikana luso ndi homogeneity wa zipangizo mwatsopano osakaniza, kupewa delamination zakuthupi, tsankho ndi magazi, ndipo angagwiritsidwe ntchito CHIKWANGWANI konkire, pansi pa madzi konkire ndi kudziletsa compacting konkire.
Kukhuthala kwa cellulose ether pazida zopangira simenti kumachokera ku viscosity ya cellulose ether solution. Pansi pazikhalidwe zomwezo, kukweza kukhuthala kwa cellulose ether, kumapangitsanso kukhuthala kwazinthu zosinthidwa za simenti, koma ngati mamasukidwe ake ndi okwera kwambiri, zimakhudza kutulutsa ndi magwiridwe antchito azinthu (monga kumata mpeni wopaka pulasitala). ). Mtondo wodziyimira pawokha ndi konkriti wodziphatika, zomwe zimafunikira madzi ambiri, zimafunikira kukhuthala kwa cellulose ether. Kuphatikiza apo, kukhuthala kwa cellulose ether kumawonjezera kufunikira kwamadzi pazinthu zopangira simenti ndikuwonjezera zokolola zamatope.
High-viscosity cellulose ether amadzimadzi njira ali mkulu thixotropy, amenenso ndi khalidwe lalikulu la mapadi ether. Amadzimadzi njira methyl mapadi zambiri pseudoplastic ndi sanali thixotropic fluidity m'munsimu ake gel osakaniza kutentha, koma kusonyeza Newtonian otaya katundu pa otsika kukameta ubweya mitengo. Pseudoplasticity imawonjezeka ndi kulemera kwa maselo kapena kuchuluka kwa cellulose ether, mosasamala kanthu za mtundu wa cholowa m'malo ndi kuchuluka kwa m'malo. Choncho, ma cellulose ethers a kalasi yofanana ya viscosity, mosasamala kanthu za MC, HPMC, HEMC, nthawi zonse amawonetsa zofanana za rheological malinga ngati ndende ndi kutentha zimasungidwa nthawi zonse. Ma gels apangidwe amapangidwa pamene kutentha kumakwera, ndipo kutuluka kwa thixotropic kwambiri kumachitika.
Mkulu ndende ndi otsika mamasukidwe akayendedwe mapadi ethers amasonyeza thixotropy ngakhale pansi pa kutentha gel osakaniza. Katunduyu ndiwopindulitsa kwambiri pakuwongolera kusanja ndi kugwa pakupanga matope omangira. Payenera kufotokozedwa apa kuti kukwezeka kwa kukhuthala kwa cellulose ether, kusungika kwamadzi kwabwino, koma kukhuthala kwamphamvu, kumapangitsanso kuchuluka kwa maselo a cellulose ether, komanso kuchepa kofananira ndi kusungunuka kwake, komwe kumakhala ndi zotsatira zoyipa. pa ndende yamatope ndi ntchito yomanga.
Nthawi yotumiza: Dec-01-2022