Magulu a hydroxyl pacellulose ethermamolekyu ndi maatomu a okosijeni pazitsulo za ether zidzapanga mgwirizano wa haidrojeni ndi mamolekyu amadzi, kutembenuza madzi aulere kukhala madzi omangika, motero amasewera bwino posungira madzi; kuyanjana pakati pa mamolekyu amadzi ndi mapadi a cellulose etha maselo unyolo amalola mamolekyu amadzi kulowa mkati mwa cellulose etere macromolecular unyolo ndikukhala ndi zopinga zamphamvu, potero kupanga madzi aulere ndi madzi opindika, omwe amathandizira kuti madzi asungidwe a simenti slurry; cellulose etha bwino rheological katundu, porous maukonde dongosolo ndi osmotic kuthamanga kwa mwatsopano simenti slurry kapena filimu kupanga katundu wa mapadi ether amalepheretsa kufalikira kwa madzi.
Kusungidwa kwamadzi kwa cellulose ether komweko kumachokera ku kusungunuka ndi kutaya madzi m'thupi kwa cellulose ether yokha. Mphamvu ya hydration ya magulu a hydroxyl yokha sikokwanira kulipira zomangira zolimba za haidrojeni ndi mphamvu za van der Waals pakati pa mamolekyu, kotero zimangotupa koma sizisungunuka m'madzi. Pamene zolowa m'malo anadzetsa mu unyolo maselo, osati m'malo kuwononga unyolo haidrojeni, komanso interchain wa haidrojeni nsinga amawonongedwa chifukwa wedging wa m'malo pakati moyandikana unyolo. Kukula kwa zolowa m'malo, kumapangitsanso mtunda wautali pakati pa mamolekyu, komanso zotsatira zowononga ma hydrogen bond. Pambuyo pa lattice ya cellulose ikuphulika, yankho limalowa, ndipo cellulose ether imakhala yosungunuka m'madzi, ndikupanga njira yowonjezereka ya viscosity, yomwe imagwira ntchito posungira madzi.
Zomwe zimakhudza kasungidwe ka madzi:
Makanema: Kukhuthala kwakukulu kwa cellulose ether, kumapangitsa kuti madzi asungidwe bwino, koma kukhuthala kwamphamvu, kumapangitsanso kuchuluka kwa maselo a cellulose ether, komanso kusungunuka kwake kumachepa, zomwe zimasokoneza magwiridwe antchito ndi zomangamanga. cha matope. Nthawi zambiri, pamtundu womwewo, zotsatira za viscosity zoyezedwa ndi njira zosiyanasiyana ndizosiyana kwambiri, kotero poyerekeza kukhuthala, ziyenera kuchitika pakati pa njira zoyesera zomwezo (kuphatikiza kutentha, rotor, ndi zina).
Kuchuluka kowonjezera: Kuchuluka kwa cellulose ether kuwonjezeredwa mumatope, kumapangitsa kuti madzi asungidwe bwino. Nthawi zambiri, kachulukidwe kakang'ono ka cellulose ether kumatha kusintha kwambiri kuchuluka kwamadzi posungira matope. Kuchulukako kukafika pamlingo wina, kachitidwe kakuchulukirachulukira kwamadzi kumachepa.
Tinthu tating'onoting'ono: Tinthu tating'onoting'ono timakhala tomwe timasunga madzi bwino. Tinthu tating'onoting'ono ta cellulose ether tikakumana ndi madzi, pamwamba pake amasungunuka ndikupanga gel osakaniza kuti mamolekyu amadzi asapitirire kulowa. Nthawi zina, ngakhale yaitali yogwira mtima sangathe kukwaniritsa yunifolomu kubalalitsidwa ndi kuvunda, kupanga turbid flocculent njira kapena agglomeration, zimene zimakhudza kwambiri madzi posungira mapadi ether. Kusungunuka ndi chimodzi mwazinthu zopangira cellulose ether. Fineness ndiyenso chizindikiro chofunikira cha methyl cellulose ether. Fineness imakhudza kusungunuka kwa methyl cellulose ether. Coarser MC nthawi zambiri imakhala ya granular ndipo imatha kusungunuka mosavuta m'madzi popanda kuphatikizika, koma kusungunuka kumakhala pang'onopang'ono ndipo sikoyenera kugwiritsidwa ntchito mumatope owuma.
Kutentha: Pamene kutentha kozungulira kumakwera, kusungirako madzi kwa cellulose ethers nthawi zambiri kumachepa, koma ena osinthidwa a cellulose ether amakhalanso ndi madzi osungira bwino pansi pa kutentha kwakukulu; kutentha kukakwera, hydration ya ma polima imafooka, ndipo madzi pakati pa maunyolo amachotsedwa. Pamene kutaya madzi m'thupi kuli kokwanira, mamolekyu amayamba kusonkhana kuti apange gel osakaniza maukonde atatu.
Mapangidwe a ma cell: Ma cellulose ether okhala ndi m'malo ochepa amakhala ndi madzi osungira bwino.
Thickening ndi thixotropy
Kukhuthala:
Mphamvu yomangirira komanso magwiridwe antchito oletsa kugwedezeka: Ma cellulose ether amapatsa matope onyowa kukhuthala kwabwino kwambiri, komwe kumatha kukulitsa luso lomangirira lamatope ndi gawo loyambira ndikuwongolera magwiridwe antchito amatope. Amagwiritsidwa ntchito kwambiri popaka matope, matope omangira matayala ndi njira yotchinjiriza kunja kwa khoma 3.
Mmene zinthu homogeneity: The thickening zotsatira za mapadi ethers angathenso kuonjezera odana ndi kumwazikana luso ndi homogeneity wa zipangizo mwatsopano osakaniza, kupewa stratification zinthu, tsankho ndi madzi seepage, ndipo angagwiritsidwe ntchito CHIKWANGWANI konkire, pansi pa madzi konkire ndi kudzipangira compacting konkire. .
Magwero ndi mphamvu ya kukhuthala: Kukhuthala kwa cellulose ether pa zinthu zopangidwa ndi simenti kumachokera ku viscosity ya cellulose ether solution. Pazifukwa zomwezo, kukhathamiritsa kwamphamvu kwa cellulose ether, kumapangitsanso kukhuthala kwa zida zosinthidwa za simenti, koma ngati mamasukidwe ake ndi okwera kwambiri, zimakhudza kutulutsa ndi magwiridwe antchito azinthu (monga kumamatira kumpeni wopaka utoto. ). Mtondo wodziyimira pawokha ndi konkriti yodzipangira yokha yokhala ndi zofunikira zamadzimadzi zambiri zimafunikira kukhuthala kotsika kwambiri kwa cellulose ether. Kuphatikiza apo, kukhuthala kwa cellulose ether kudzakulitsanso kufunikira kwa madzi pazinthu zopangira simenti ndikuwonjezera kutulutsa kwamatope.
Thixotropy:
High-viscosity cellulose ether amadzimadzi njira ali mkulu thixotropy, amenenso ndi khalidwe lalikulu la mapadi ether. The amadzimadzi njira ya methyl mapadi zambiri pseudoplasticity ndi sanali thixotropic fluidity m'munsimu ake gel osakaniza kutentha, koma amaonetsa Newtonian otaya katundu pa otsika kukameta ubweya mitengo. Pseudoplasticity imawonjezeka ndi kuchuluka kwa cellulose etha kulemera kwa maselo kapena ndende, ndipo ilibe kanthu kochita ndi mtundu wa cholowa m'malo ndi digiri ya m'malo. Choncho, ma cellulose ethers a kalasi yofanana ya viscosity, kaya MC, HPMC, kapena HEMC, nthawi zonse amasonyeza zofanana za rheological malinga ngati ndende ndi kutentha kumakhalabe kosasintha. Kutentha kumakwera, gel osakaniza amapangidwa, ndipo kutuluka kwa thixotropic kumapezeka. Ma cellulose ether okhala ndi ndende yayikulu komanso mawonekedwe otsika amawonetsa thixotropy ngakhale pansi pa kutentha kwa gel osakaniza. Katunduyu ndiwopindulitsa kwambiri posintha masinthidwe ndi kugwa kwa matope omangira pomanga.
Kulowetsedwa kwa mpweya
Mfundo ndi zotsatira zake pakugwira ntchito: Ma cellulose ether ali ndi mphamvu yolumikizira 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). Ndi surfactant ndi pamwamba ntchito, motero amakhala ndi mpweya entrainment kwenikweni. Kulowetsedwa kwa mpweya kudzatulutsa zotsatira za mpira, zomwe zingathe kupititsa patsogolo ntchito ya zipangizo zatsopano zosakanikirana, monga kuonjezera pulasitiki ndi kusalala kwa matope panthawi ya ntchito, zomwe zimapindulitsa kufalitsa matope; zidzawonjezeranso kutulutsa kwamatope ndikuchepetsa mtengo wopangira matope.
Mphamvu yamakina: Mphamvu yolowera mpweya imakulitsa porosity ya zinthu zowumitsidwa ndikuchepetsa mawotchi ake monga mphamvu ndi zotanuka modulus.
Mmene fluidity: Monga surfactant, mapadi ether alinso wetting kapena lubricating kwenikweni pa particles simenti, amene pamodzi ndi mpweya entraining zotsatira kumawonjezera fluidity wa zipangizo simenti ofotokoza, koma thickening zotsatira kuchepetsa fluidity. Zotsatira za cellulose ether pa fluidity ya zinthu zochokera simenti ndi osakaniza plasticizing ndi thickening zotsatira. Nthawi zambiri, pamene mlingo wa cellulose ether uli wotsika kwambiri, umawonekera makamaka ngati pulasitiki kapena zotsatira zochepetsera madzi; pamene mlingo uli wochuluka, mphamvu yowonjezereka ya cellulose ether imakula mofulumira, ndipo mpweya wake wolowetsa mpweya umakhala wodzaza, choncho umawoneka ngati makulidwe kapena kuwonjezeka kwa madzi.
Nthawi yotumiza: Dec-23-2024