Hydroxypropyl methyl cellulose HPMC ndi cellulose ether yosakhala ionic yopangidwa kuchokera ku cellulose yachilengedwe ya polima kudzera mumndandanda wamankhwala. Ndiwopanda fungo, wopanda pake komanso wopanda poizoni wa ufa woyera womwe umatuluka m'madzi ozizira kapena owoneka bwino. Lili ndi makhalidwe a thickening, kugwirizana, kubalalitsidwa, emulsification, filimu mapangidwe, kuyimitsidwa, adsorption, gelation, pamwamba ntchito, kusunga chinyezi ndi colloid zoteteza. Hydroxypropyl methylcellulose angagwiritsidwe ntchito zipangizo zomangira, ❖ kuyanika makampani, kupanga utomoni, makampani ceramic, mankhwala, chakudya, nsalu, ulimi, tsiku makampani mankhwala ndi mafakitale ena.
Ntchito yosungira madzi ndi mfundo: cellulose etha HPMC makamaka imagwira ntchito yosungira madzi ndi kukhuthala mumatope a simenti ndi matope opangidwa ndi gypsum, omwe amatha kusintha mphamvu zomangira ndi kukana kwa slurry. Zinthu monga kutentha kwa mpweya, kutentha ndi kuthamanga kwa mphepo zidzakhudza kusinthasintha kwa madzi mumatope a simenti ndi zinthu zopangidwa ndi gypsum. Chifukwa chake, munyengo zosiyanasiyana, pali kusiyana kwina pakusunga madzi kwa kuchuluka komweko kwa zinthu za HPMC. Pakumanga kwapadera, mphamvu yosungira madzi ya slurry imatha kusinthidwa ndikuwonjezera kapena kuchepetsa kuchuluka kwa HPMC yowonjezeredwa.
Kusungidwa kwa madzi kwa methyl cellulose ether pansi pa kutentha kwakukulu ndi chizindikiro chofunikira kusiyanitsa ubwino wa methyl cellulose ether. Zabwino kwambiri HPMC mndandanda mankhwala angathe kuthetsa vuto la posungira madzi pa kutentha kwambiri. M'nyengo zotentha kwambiri, makamaka m'malo otentha komanso owuma komanso zomangira zowonda kwambiri kumbali yadzuwa, HPMC yapamwamba imafunika kuti ipititse patsogolo kusunga madzi kwa slurry.
HPMC yapamwamba kwambiri imakhala yabwino kwambiri. Magulu ake a methoxy ndi hydroxypropoxy amagawidwa mofanana pamagulu a cellulose maselo, omwe amatha kupititsa patsogolo luso la maatomu a okosijeni pamagulu a hydroxyl ndi ether kuti agwirizane ndi madzi kuti apange ma hydrogen bond. , Kuti madzi aulere akhale omangika madzi, potero amawongolera bwino kutuluka kwa madzi chifukwa cha kutentha kwanyengo, ndikukwaniritsa kusungirako madzi ambiri.
Zapamwamba mapadi HPMC akhoza uniformly ndi mogwira omwazikana mu matope simenti ndi gypsum ofotokoza mankhwala, ndi kukulunga particles onse olimba, ndi kupanga wosanjikiza wa wetting filimu. Madzi m'munsi amamasulidwa pang'onopang'ono kwa nthawi yaitali. Zinthu zofupikitsidwa zimakumana ndi hydration reaction, kuti zitsimikizire kulimba kolumikizana ndi kulimba kwa zinthuzo. Chifukwa chake, pakumanga kwanyengo yachilimwe yotentha kwambiri, kuti mukwaniritse kusungirako madzi, zinthu zapamwamba za HPMC ziyenera kuwonjezeredwa kuchuluka kokwanira molingana ndi chilinganizo, apo ayi, kusakwanira kwa hydration, kuchepa mphamvu, kusweka, kugwetsa ndi kugwa. zitha kuchitika chifukwa cha kuyanika kwambiri. Mavuto, komanso amawonjezera zovuta za ogwira ntchito yomanga. Pamene kutentha kumachepa, kuchuluka kwa HPMC kuwonjezeredwa kungathe kuchepetsedwa pang'onopang'ono, ndipo zotsatira zofanana zosungira madzi zimatha kupezeka.
Kusungidwa kwa madzi kwa HPMC kumakhudzidwa ndi izi:
1. Homogeneity wa cellulose ether HPMC
Mu HPMC yopangidwa ndi homogeneous, magulu a methoxy ndi hydroxypropoxy amagawidwa mofanana, ndipo chiwerengero chosungira madzi ndichokwera.
2. Kutentha kwa gel osakaniza a cellulose ether HPMC
Kutentha kwa gel osakaniza ndikwambiri, kuchuluka kwa madzi osungirako ndikokwera; m'malo mwake, kuchuluka kwa kusunga madzi kumakhala kochepa.
3. Viscosity ya cellulose ether HPMC
Pamene mamasukidwe akayendedwe a HPMC akuwonjezeka, kuchuluka kwa madzi osungirako kumawonjezekanso; pamene mamasukidwe akayendedwe afika pamlingo wina, kuwonjezeka kwa madzi osungira madzi kumakhala kosalala.
4. Kuwonjezera pa cellulose ether HPMC
Kuchuluka kwa cellulose ether HPMC kuwonjezeredwa, kumapangitsa kuti madzi asungidwe komanso kuti madzi asungidwe bwino. Pakati pa 0.25-0.6% yowonjezera, kuchuluka kwa madzi osungira madzi kumawonjezeka mofulumira ndi kuwonjezeka kwa ndalama zowonjezera; pamene kuchuluka kwa madzi kumawonjezeka, kuchuluka kwa madzi osungira madzi kumachepa.
Nthawi yotumiza: Dec-16-2021