Hydroxypropyl methylcellulose (HPMC) ndi ether ya cellulose yosakhala ionic yopangidwa kuchokera ku cellulose yachilengedwe ya polymer kudzera mu njira zingapo zamakemikolo. Ndi ufa woyera wopanda fungo, wopanda kukoma komanso wopanda poizoni womwe umatupa kukhala yankho la colloidal loyera kapena lamtambo pang'ono m'madzi ozizira. Lili ndi makulidwe, kumangirira, kufalitsa, kusakaniza, kupanga filimu, kuyimitsa, kusakaniza, gelling, kugwira ntchito pamwamba, kusunga chinyezi komanso kuteteza colloides. Hydroxypropyl methyl cellulose ndi methyl cellulose zingagwiritsidwe ntchito mu zipangizo zomangira, makampani opanga utoto, utomoni wopangidwa, mafakitale a ceramic, mankhwala, chakudya, nsalu, ulimi, mankhwala a tsiku ndi tsiku ndi mafakitale ena.
Mphamvu yosungira madzi ndi mfundo ya hydroxypropyl methylcellulose HPMC
Cellulose ether HPMC makamaka imagwira ntchito yosunga ndi kukhuthala madzi mu simenti ndi matope okhala ndi gypsum, ndipo imatha kukonza bwino mphamvu yogwirizana komanso kukana kwa matope.
Zinthu monga kutentha kwa mpweya, kutentha ndi kuthamanga kwa mphepo zimakhudza kuchuluka kwa madzi mu simenti ndi zinthu zopangidwa ndi gypsum. Chifukwa chake, m'nyengo zosiyanasiyana, pali kusiyana pakati pa zotsatira za kusunga madzi ndi kuchuluka komweko kwa HPMC. Pakupanga kwake, mphamvu ya kusunga madzi ya slurry ingasinthidwe powonjezera kapena kuchepetsa kuchuluka kwa HPMC yowonjezera. Kusunga madzi kwa methyl cellulose ether pansi pa kutentha kwakukulu ndi chizindikiro chofunikira chosiyanitsa mtundu wa methyl cellulose ether. Zogulitsa zabwino kwambiri za HPMC zitha kuthetsa vuto la kusunga madzi pansi pa kutentha kwakukulu. M'nyengo yotentha kwambiri, makamaka m'malo otentha komanso ouma komanso kapangidwe kowonda kumbali ya dzuwa, HPMC yapamwamba imafunika kuti iwonjezere kusunga madzi kwa slurry. HPMC yapamwamba kwambiri ili ndi kufanana kwabwino kwambiri. Magulu ake a methoxy ndi hydroxypropoxy amagawidwa mofanana pamzere wa maselo a cellulose, zomwe zimatha kukonza kuthekera kwa maatomu a okosijeni pa ma hydroxyl ndi ether kuti agwirizane ndi madzi kuti apange ma hydrogen bonds. , kuti madzi omasuka akhale omangika, kuti azitha kuwongolera bwino kuuluka kwa madzi komwe kumachitika chifukwa cha kutentha kwambiri, ndikupangitsa kuti madzi asungidwe bwino.
HPMC yapamwamba kwambiri ya cellulose imatha kufalikira mofanana komanso moyenera mu simenti ndi zinthu zopangidwa ndi gypsum, ndikukulunga tinthu tonse tolimba, ndikupanga filimu yonyowetsa, chinyezi chomwe chili pansi chimatulutsidwa pang'onopang'ono kwa nthawi yayitali, ndipo guluu wosapangidwa. Kuyankha kwa hydration kwa zinthu zomatira kudzaonetsetsa kuti zinthuzo zimakhala zolimba komanso zolimba. Chifukwa chake, pomanga kutentha kwambiri kwa chilimwe, kuti tikwaniritse zotsatira zosungira madzi, ndikofunikira kuwonjezera zinthu zapamwamba za HPMC mokwanira malinga ndi njira yopangira, apo ayi, padzakhala hydration yokwanira, mphamvu yochepa, ming'alu, kutsekeka ndi kutayika komwe kumachitika chifukwa cha kuuma kwambiri. Mavuto, komanso kuwonjezera zovuta zomangira. Pamene kutentha kukutsika, kuchuluka kwa madzi omwe HPMC yowonjezera kumatha kuchepetsedwa pang'onopang'ono, ndipo zotsatira zomwezo zosungira madzi zitha kupezeka.
Kusunga madzi kwa hydroxypropyl methylcellulose HPMC mankhwala nthawi zambiri kumakhudzidwa ndi zinthu zotsatirazi:
HPMC, methoxyl ndi hydroxypropoxyl zomwe zimayanjanitsidwa mofanana zimagawidwa mofanana, ndipo kuchuluka kwa madzi omwe amasungidwa kumakhala kwakukulu;
Kutentha kwa gel yotenthetsera ya cellulose ether HPMC ndi kokwera, kuchuluka kwa madzi osungira madzi ndi kokwera; apo ayi, kuchuluka kwa madzi osungira madzi ndi kotsika;
Pamene kukhuthala kwa ether ya cellulose HPMC kukuwonjezeka, kuchuluka kwa madzi kumawonjezekanso; pamene kukhuthala kufika pamlingo winawake, kuwonjezeka kwa kuchuluka kwa madzi kumachepa;
Kuchuluka kwa ether ya cellulose HPMC ikawonjezeredwa, kuchuluka kwa madzi omwe amasungidwa kumawonjezeka ndipo kuchuluka kwa madzi omwe amasungidwa kumawonjezeka. Pakuwonjezeka kwa 0.25-0.6%, kuchuluka kwa madzi omwe amasungidwa kumawonjezeka mwachangu ndi kuchuluka kwa madzi omwe amawonjezeredwa; pamene kuchuluka kwa madzi omwe amawonjezeredwa kumawonjezeka, kuchuluka kwa madzi omwe amasungidwa kumachepa.
Nthawi yotumizira: Juni-01-2023