Mumatope osakaniza okonzeka, kaphatikizidwe ka cellulose kakang'ono kokha kamene kamatha kusintha kwambiri ntchito yamatope onyowa. Zitha kuwoneka kuti cellulose ether ndiye chowonjezera chachikulu chomwe chimakhudza magwiridwe antchito a matope.
Kusankha mitundu yosiyanasiyana ya ma cellulose ethers okhala ndi ma viscosities osiyanasiyana, kukula kwa tinthu kosiyanasiyana, ma viscosity osiyanasiyana ndi kuchuluka kwake kudzakhalanso ndi zotsatira zosiyanasiyana pakuwongolera magwiridwe antchito a matope a drymix. Pakalipano, matope ambiri omanga ndi pulasitala alibe ntchito yosunga madzi bwino. Madzi ndi slurry zidzalekanitsidwa pambuyo pa mphindi zingapo kuyimirira. Chifukwa chake ndikofunikira kwambiri kuwonjezera cellulose ether kumatope a simenti.
Tiyeni tiwone mwatsatanetsatane ntchito ya cellulose ether mumatope a simenti!
1. Ma cellulose ether--Kusunga madzi
Kusungirako madzi ndi ntchito yofunika kwambiri ya methyl cellulose ether, komanso ndikuchitanso komwe opanga matope ambiri am'nyumba, makamaka omwe ali kumadera akum'mwera komwe kutentha kumatchera khutu. 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, kukulirakulira kwa kukhuthala kwa cellulose ether, ndikokwanira kusunga madzi; Kuchuluka kwa mlingo, kumapangitsa kuti madzi asungidwe bwino. Nthawi zambiri, kalingo kakang'ono ka cellulose ether kumatha kusintha kwambiri kusungidwa kwamadzi mumatope. Mlingo ukafika pamlingo wakutiwakuti, pamene kuchuluka kwa kusungirako madzi kumawonjezeka, chizolowezi chosungira madzi chimachepa; Kutentha kozungulira kukakwera, kusungidwa kwamadzi kwa cellulose ether kumachepa. Koma ma ether ena osinthidwa a cellulose amakhalanso ndi madzi osungira bwino pansi pa kutentha kwakukulu; Ma cellulose ether okhala ndi ma degree otsika olowa m'malo 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;Themadzi molekyulu ndi mapalo etero maselo unyolo Interdiffusion amalola mamolekyu madzi kulowa mkati mwa mapalo etere macromolecular unyolo ndi pansi amphamvu kumanga mphamvu, potero kupanga madzi aulere, madzi opiringizika, ndi kuwongolera madzi posungira simenti slurry; Ma cellulose ether amawongolera mawonekedwe a simenti ya slurry, mawonekedwe a porous network ndi kuthamanga kwa osmotic kapena kupanga filimu ya cellulose ether kumalepheretsa kufalikira kwa madzi.
2. Ma cellulose ethers - Thickening ndi Thixotropy
Ma cellulose ether amapangitsa 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 a anti-sag. Amagwiritsidwa ntchito kwambiri popaka matope, matope omangira njerwa ndi njira yotchinjiriza kunja. Kukhuthala kwa cellulose ether kumathanso kukulitsa luso lodana ndi kubalalika ndi homogeneity ya zida zosakanikirana zatsopano, kupewa delamination zakuthupi ndi tsankho. Itha kugwiritsidwa ntchito mu konkire ya fiber, konkire ya pansi pamadzi komanso yodzipangira yokha.
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, kaya ndi HPMC kapena HEMC, nthawi zonse amawonetsa zizindikiro zofanana za rheological malinga ngati ndende ndi kutentha kumasungidwa 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 kugwedera pakumanga 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.
3. Ma cellulose ether - Air-entraining effect
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. Mpweya wolowetsa mpweya wa cellulose ether udzatulutsa "mpira", womwe ukhoza kupititsa patsogolo ntchito ya zinthu zatsopano zosakanikirana, monga kuonjezera pulasitiki ndi kusalala kwa matope panthawi yogwira ntchito, zomwe zimathandiza kufalitsa matope. ; 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.
4. Selulosi Etha - 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.
Nthawi yotumiza: Jun-02-2023