Cellulose etherIli ndi madzi abwino kwambiri osungira, zomwe zingalepheretse chinyezi chomwe chili mu matope onyowa kuti chisanyowe msanga kapena kuyamwa ndi maziko, ndikuwonetsetsa kuti simentiyo ili ndi madzi okwanira, potero potsiriza kuonetsetsa kuti matopewo ali ndi mphamvu zogwirira ntchito, zomwe zimathandiza kwambiri matope opyapyala komanso onyowa omwe amayamwa madzi kapena matope omangidwa pansi pa kutentha kwambiri komanso kouma. Kusunga madzi kwa ether ya cellulose kumatha kusintha njira yomangira yachikhalidwe ndikukweza kupita patsogolo kwa zomangamanga. Mwachitsanzo, kumanga pulasitala kumatha kuchitika pazitsulo zoyamwa madzi popanda kunyowetsa kale.
Kukhuthala, mlingo, kutentha kwa malo ozungulira, ndi kapangidwe ka maselo a cellulose ether zimakhudza kwambiri momwe imagwirira ntchito posunga madzi. Pansi pa mikhalidwe yomweyi, kukhuthala kwa cellulose ether kumakhala kwakukulu, kusungunuka kwa madzi kumakhala bwino; mlingo ukakwera, kusungunuka kwa madzi kumakhala bwino. Nthawi zambiri, kuchuluka kochepa kwa cellulose ether kumatha kusintha kwambiri kusungunuka kwa madzi mu matope. Mlingo ukafika pamlingo winawake Pamene kuchuluka kwa kusungunuka kwa madzi kumawonjezeka, kuchuluka kwa kusungunuka kwa madzi kumachepa; kutentha kwa malo ozungulira kukakwera, kusungunuka kwa madzi kwa cellulose ether nthawi zambiri kumachepa, koma ma cellulose ether ena osinthidwa nawonso amakhala ndi kusungunuka kwa madzi bwino pansi pa kutentha kwakukulu; ulusi wokhala ndi madigiri otsika a Vegan ether umakhala ndi kusungunuka kwabwino kwa madzi.
Gulu la hydroxyl pa molekyulu ya cellulose ether ndi atomu ya okosijeni pa ether bond zidzagwirizana ndi molekyulu yamadzi kuti zipange chomangira cha haidrojeni, kusandutsa madzi omasuka kukhala madzi omangika, motero zimagwira ntchito yabwino pakusunga madzi; molekyulu yamadzi ndi cellulose ether molecular chain Interdiffusion imalola mamolekyulu amadzi kulowa mkati mwa cellulose ether macromolecular chain ndipo imakumana ndi mphamvu zolimba zomangika, motero kupanga madzi omangika ndi madzi omangika, zomwe zimapangitsa kuti simenti isamamatire madzi; cellulose ether imakonza simenti yatsopano. Kapangidwe ka rheological, kapangidwe ka netiweki yokhala ndi porous ndi kuthamanga kwa osmotic kapena kapangidwe ka filimu ka cellulose ether kamalepheretsa kufalikira kwa madzi.
Cellulose ether imapatsa matope onyowa kukhuthala kwabwino kwambiri, komwe kumatha kuwonjezera mphamvu yolumikizirana pakati pa matope onyowa ndi maziko, ndikuwonjezera magwiridwe antchito a matope oletsa kugwa. Amagwiritsidwa ntchito kwambiri popaka matope, matope olumikizirana njerwa ndi makina oteteza makoma akunja. Mphamvu yokhuthala ya ether ya cellulose ingathandizenso kuwonjezera mphamvu yotsutsana ndi kufalikira ndi kufanana kwa zinthu zatsopano zosakanikirana, kupewa kugawanika kwa zinthu, kulekanitsa ndi kutuluka magazi, ndipo ingagwiritsidwe ntchito mu konkriti ya ulusi, konkriti ya pansi pa madzi ndi konkriti yodzikakamiza yokha.
Mphamvu yokhuthala ya cellulose ether pa zinthu zopangidwa ndi simenti imachokera ku kukhuthala kwa yankho la cellulose ether. Pansi pa mikhalidwe yomweyi, kukhuthala kwa cellulose ether kukakwera, kukhuthala kwa zinthu zopangidwa ndi simenti yosinthidwa kumakhala bwino, koma ngati kukhuthala kuli kwakukulu, kudzakhudza kusinthasintha ndi kugwira ntchito kwa zinthuzo (monga kuyika mpeni wopaka pulasitala). Mtondo wodziyimira pawokha ndi konkire wodzigwirizanitsa, zomwe zimafuna kukhuthala kwakukulu, zimafuna kukhuthala kochepa kwa cellulose ether. Kuphatikiza apo, kukhuthala kwa cellulose ether kudzawonjezera kufunikira kwa madzi kwa zinthu zopangidwa ndi simenti ndikuwonjezera kuchuluka kwa matope.
Kukhuthala kwa yankho la ether la cellulose kumadalira zinthu zotsatirazi: kulemera kwa maselo a ether ya cellulose, kuchuluka, kutentha, kuchuluka kwa shear ndi njira yoyesera. Pansi pa mikhalidwe yomweyi, kulemera kwa maselo a ether ya cellulose kumakhala kwakukulu, kuchuluka kwa shear kumakwera; kuchuluka kwa shear kumakwera, kuchuluka kwa shear kumakwera. Mukamagwiritsa ntchito, muyenera kusamala kuti mupewe kuchuluka kwa shear ndi konkire; ether ya cellulose Kukhuthala kwa yankho la ether kumachepa ndi kutentha, ndipo kuchuluka kwa shear kumakwera, kutentha kumakhudza kwambiri; yankho la ether la cellulose nthawi zambiri ndi madzi a pseudoplastic omwe amatha kuchepetsedwa ndi shear, kuchuluka kwa shear panthawi yoyesa, kuchepa kwa shear, chifukwa chake, mgwirizano wa shear udzachepa chifukwa cha mphamvu yakunja, zomwe zimathandiza pakupanga shear, kuti shear ikhale yogwira ntchito bwino komanso yogwirizana nthawi yomweyo; chifukwa yankho la ether ya cellulose si la Newtonian. Pa madzi, pamene njira zoyesera, zida ndi zida kapena malo oyesera omwe amagwiritsidwa ntchito poyesa kukhuthala ndi osiyana, zotsatira za mayeso a yankho lomwelo la ether ya cellulose zidzakhala zosiyana kwambiri.
Mamolekyulu a ether a cellulose amatha kuyika mamolekyulu ena amadzi a zinthu zatsopano m'mphepete mwa unyolo wa mamolekyulu, motero kuwonjezera kukhuthala kwa yankho. Maunyolo a mamolekyulu a ether ya cellulose amalumikizana kuti apange kapangidwe ka netiweki ya magawo atatu, zomwe zimapangitsanso kuti yankho lake lamadzi likhale ndi kukhuthala kwabwino.
Yankho lamadzi la cellulose ether lokhala ndi kukhuthala kwakukulu lili ndi thixotropy yambiri, yomwe ndi khalidwe lalikulu la cellulose ether.methyl celluloseKawirikawiri amakhala ndi pseudoplastic ndi non-thixotropic fluidity pansi pa kutentha kwa gel, koma amasonyeza makhalidwe a Newtonian flow pamlingo wotsika wa shear. Pseudoplasticity imawonjezeka ndi kulemera kwa molekyulu kapena kuchuluka kwa cellulose ether, mosasamala kanthu za mtundu wa cholowa m'malo ndi mlingo wa cholowa m'malo. Chifukwa chake, cellulose ethers ya viscosity grade yomweyo, mosasamala kanthu za mc, HPmc, HEmc, nthawi zonse imawonetsa makhalidwe ofanana a rheological bola ngati kuchuluka ndi kutentha zimasungidwa nthawi zonse. Ma gels omangira amapangidwa kutentha kukakwera, ndipo kuyenda kwa thixotropic kwambiri kumachitika. Ma ethers a cellulose okhala ndi kuchuluka kwakukulu komanso kukhuthala kochepa amawonetsa thixotropy ngakhale pansi pa kutentha kwa gel. Katunduyu ndi wothandiza kwambiri pakusintha kwa kulinganiza ndi kutsika pomanga matope omangira. Apa ndikofunikira kufotokoza kuti kukhuthala kwa cellulose ether kumakhala kwakukulu, kumakhala bwino kusunga madzi, koma kukhuthala kwakukulu, kulemera kwa cellulose ether kumakhala kwakukulu, komanso kuchepa kofanana kwa kusungunuka kwake, komwe kumakhudza kwambiri kuchuluka kwa matope ndi magwiridwe antchito omanga. Kukhuthala kwakukulu, kukhuthala kwa matope kumaonekera bwino, koma sikufanana kwenikweni. Kukhuthala pang'ono kwapakati ndi kochepa, koma etha yosinthidwa ya cellulose imakhala ndi magwiridwe antchito abwino pakukweza mphamvu ya kapangidwe ka matope onyowa. Ndi kuwonjezeka kwa kukhuthala, kusunga madzi kwa etha ya cellulose kumakula.
Nthawi yotumizira: Epulo-28-2024