chimodzi. Kusiyana pakati pa zoipitsidwahydroxypropyl methylcellulose (HPMC)ndi hydroxypropyl methylcellulose yoyera (HPMC)
1. Mawonekedwe: Hydroxypropyl methylcellulose HPMC yoyera imawoneka yofewa ndipo ili ndi kachulukidwe kochepa, kuyambira 0.3-0.4g/ml; HPMC yosakanikirana imakhala ndi kusinthasintha kwabwino ndipo imamveka yolemera, ndipo pali kusiyana kwakukulu pa mawonekedwe ake ndi chinthu chenicheni.
2. Mkhalidwe: Ufa wa hydroxypropyl methylcellulose HPMC ndi wa ulusi pansi pa maikulosikopu kapena galasi lokulitsa; pomwe hydroxypropyl methylcellulose HPMC yosakanikirana imatha kuwonedwa ngati granular solids kapena crystals pansi pa maikulosikopu kapena galasi lokulitsa.
3. Fungo: Hydroxypropyl methylcellulose yoyera HPMC singathe kununkhiza fungo la ammonia, starch ndi mowa; HPMC yosakanikirana imatha kununkhiza fungo la mitundu yonse, ngakhale itakhala yopanda kukoma, imamva yolemera.
4. Yankho lamadzi: yankho lamadzi la hydroxypropyl methylcellulose la HPMC ndi loyera, limadutsa kuwala kwambiri, limasunga madzi ≥ 97%; yankho lamadzi la hydroxypropyl methylcellulose la HPMC ndi lopanda madzi, ndipo kuchuluka kwa madzi komwe kumasunga madzi n'kovuta kufika pa 80%.
Chachiwiri, kusunga madzi kwa hydroxypropyl methylcellulose HPMC, kumasiyanitsa ubwino ndi kuipa kwake:
Kusunga madzi kwa methyl cellulose ether pansi pa kutentha kwakukulu ndi chizindikiro chofunikira chosiyanitsa mtundu wa methyl cellulose ether. Zinthu monga kutentha kwa mpweya, kutentha ndi liwiro la kupanikizika 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 kwa zinthu zomwe zili ndi kuchuluka komweko kwa HPMC. Pakupanga kwake, zotsatira za kusunga madzi kwa slurry zitha kusinthidwa powonjezera kapena kuchepetsa kuchuluka kwa HPMC yowonjezeredwa. Zogulitsa zabwino kwambiri za hydroxypropyl methylcellulose HPMC zimatha kuthetsa vuto la kusunga madzi pansi pa kutentha kwakukulu.
Methylcellulose yapamwamba kwambiri 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 inorganic. Kuyankha kwa hydration kwa zinthu zopangidwa ndi gelled kumatsimikizira mphamvu yomangirira ndi mphamvu yokakamiza ya zinthuzo. Hydroxypropyl methylcellulose HPMC yapamwamba kwambiri, kufanana kwake ndi kwabwino kwambiri, magulu ake a methoxy ndi hydroxypropoxy amagawidwa mofanana pamzere wa maselo a cellulose, amatha kuwonjezera mpweya pa ma hydroxyl ndi ether bonds. Kuthekera kwa maatomu kugwirizana ndi madzi kupanga ma hydrogen bonds kumasintha madzi omasuka kukhala madzi omangika, motero kuwongolera bwino kuuluka kwa madzi komwe kumachitika chifukwa cha kutentha kwambiri komanso kukwaniritsa kusunga madzi ambiri.
Chifukwa chake, pomanga nthawi yotentha kwambiri yachilimwe, kuti madzi asungidwe bwino, ndikofunikira kuwonjezera zinthu zabwino kwambiri za HPMC mokwanira motsatira njira yopangira, apo ayi, sipadzakhala madzi okwanira, mphamvu yochepa, ming'alu, mabowo ndi kutayika kwa madzi chifukwa cha mavuto ouma kwambiri, komanso kuwonjezera zovuta zomangira. Pamene kutentha kukutsika, kuchuluka kwa madzi omwe HPMC imawonjezera kumatha kuchepetsedwa pang'onopang'ono, ndipo zotsatira zomwezo zosungira madzi zitha kupezeka.
3. Kusungunuka kwa hydroxypropyl methylcellulose HPMC
Mu makampani omanga, hydroxypropyl methylcellulose HPMC nthawi zambiri imayikidwa m'madzi osalowerera, ndipo mankhwala a HPMC amasungunuka okha kuti aweruze kuchuluka kwa kusungunuka. Pambuyo poyikidwa m'madzi osalowerera okha, mankhwala omwe amalumikizana mwachangu popanda kufalikira ndi mankhwala osagwiritsidwa ntchito pamwamba; pambuyo poyikidwa m'madzi osalowerera okha, mankhwala omwe amatha kufalikira osalumikizana ndi mankhwala omwe amakonzedwa pamwamba. Pamene hydroxypropyl methylcellulose HPMC yosakonzedwa pamwamba isungunuka yokha, tinthu take tomwe timasungunuka mwachangu ndikupanga filimu mwachangu, zomwe zimapangitsa kuti madzi asalowenso m'tinthu tina, zomwe zimapangitsa kuti pakhale kusonkhana ndi kusonkhana, komwe pakadali pano kumatchedwa kusungunuka pang'onopang'ono pamsika.
Tinthu ta hydroxypropyl methylcellulose tomwe timakonzedwa pamwamba pa madzi, m'madzi osalowerera, tinthu tating'onoting'ono tomwe timatha kufalikira popanda kusonkhana, koma kukhuthala kwa chinthucho sikudzachitika nthawi yomweyo. Pambuyo ponyowa kwa nthawi inayake, kapangidwe ka mankhwala ka mankhwala okonzedwa pamwamba pa madziwo kamawonongeka, ndipo madziwo amatha kusungunula tinthu ta HPMC. Panthawiyi, tinthu ta mankhwalawo tafalikira mokwanira ndipo timayamwa madzi okwanira, kotero chinthucho sichidzasonkhana kapena kusonkhana pambuyo posungunuka. Liwiro la kufalikira ndi liwiro la kusungunuka zimadalira kuchuluka kwa chithandizo cha pamwamba pa madziwo. Ngati chithandizo cha pamwamba chili chochepa, liwiro la kufalikira limakhala locheperako ndipo liwiro la kuuma ndi lofulumira; pomwe chinthu chokhala ndi chithandizo chakuya pamwamba pa madziwo chili ndi liwiro la kufalikira mofulumira komanso liwiro la kuuma pang'onopang'ono. Ngati mukufuna kuti zinthu zingapozi zisungunuke mwachangu mu mkhalidwe uwu, mutha kusiya zinthu zochepa za alkaline zikasungunuka zokha. Msika wapano nthawi zambiri umatchedwa zinthu zachangu. Makhalidwe a zinthu za HPMC zokonzedwa pamwamba ndi awa: mu yankho lamadzi, tinthu tating'onoting'ono timatha kufalikira tokha, zimatha kusungunuka mwachangu mu mkhalidwe wa alkaline, ndikusungunuka pang'onopang'ono mu mkhalidwe wa neutral ndi acidic.
Makhalidwe a hydroxypropyl methylcellulose HPMC yosakonzedwa ndi awa: tinthu tating'onoting'ono timasungunuka mwachangu kwambiri m'malo okhala ndi acidic, alkaline, komanso osalowerera, koma sitingathe kufalikira pakati pa tinthu tating'onoting'ono m'madzi, zomwe zimapangitsa kuti pakhale kusonkhana ndi kusonkhana. Pakugwira ntchito kwenikweni, pambuyo poti zinthu zingapo ndi tinthu tating'onoting'ono tomwe timakhala ndi tinthu tating'onoting'ono monga ufa wa rabara, simenti, mchenga, ndi zina zotero zifalikire, kuchuluka kwa kusungunuka kumakhala kofulumira kwambiri, ndipo palibe kusonkhana kapena kusonkhana. Pakufunika kusungunuka zinthu za HPMC padera, zinthu zingapozi ziyenera kugwiritsidwa ntchito mosamala, chifukwa zidzasonkhana ndikugwirana pamodzi. Ngati pakufunika kusungunuka chinthu cha hydroxypropyl methylcellulose HPMC chomwe sichinakonzedwe pamwamba pake, chiyenera kusungunuka mofanana ndi madzi otentha a 95°C, kenako kuziziritsidwa kuti chisungunuke.
Pa ntchito yeniyeni yopangira, zinthu zambirizi nthawi zambiri zimasungunuka zitasungunuka ndi tinthu tina tolimba pansi pa mikhalidwe ya alkaline, ndipo kuchuluka kwake kosungunuka sikusiyana ndi kwa zinthu zomwe sizinakonzedwe. Ndikoyeneranso kugwiritsidwa ntchito pazinthu zomwe zimasungunuka zokha, popanda kuyika kapena kupangika. Chitsanzo chenicheni cha chinthucho chingasankhidwe malinga ndi kuchuluka kwa kusungunuka komwe kumafunikira pomanga.
Pa nthawi yomanga, kaya ndi simenti kapena matope okhala ndi gypsum, ambiri mwa iwo ndi amchere, ndipo kuchuluka kwa HPMC komwe kumawonjezeredwa ndi kochepa kwambiri, komwe kumatha kufalikira mofanana pakati pa tinthu tating'onoting'ono timeneti. Madzi akawonjezeredwa,HPMCidzasungunuka mwachangu.
Nthawi yotumizira: Epulo-26-2024