Hydroxypropyl methylcellulose amagwiritsidwa ntchito mosiyanasiyana chifukwa cha nyengo

Zinthu monga kutentha kwa mpweya, kutentha ndi kuthamanga kwa mphepo zidzakhudza kusinthasintha kwa chinyezi mumatope a simenti ndi zinthu zopangidwa ndi gypsum.Choncho, mu nyengo zosiyanasiyana, mphamvu yosungira madzi yofanana ndi HPMC ndi yosiyana.

Pakumanga kwapadera, mphamvu yosungira madzi ya slurry imatha kusinthidwa ndikuwonjezera kapena kuchepetsa kuchuluka kwa HPMC yowonjezeredwa.Kusungidwa kwa madzi kwa hydroxypropyl methyl cellulose ether pansi pa kutentha kwakukulu ndi chizindikiro chofunikira kusiyanitsa khalidwe la hydroxypropyl 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 zomanga zowonda kumbali yadzuwa, HPMC yapamwamba imafunikira 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 pa hydroxyl ndi etha kuti agwirizane ndi madzi kuti apange ma hydrogen bonds, kotero kuti madzi aulere amakhala omangidwa ndi madzi, potero amawongolera bwino. kusungunuka kwa madzi chifukwa cha kutentha kwa nyengo, ndi kukwaniritsa kusungirako madzi ambiri.
Ma cellulose apamwamba kwambiri a HPMC amatha kumwazikana moyenera komanso moyenera mumatope a simenti ndi gypsum, ndikukulunga tinthu tating'onoting'ono tating'ono, ndikupanga filimu yonyowa.Madzi m'munsi amamasulidwa pang'onopang'ono kwa nthawi yaitali.Zinthu zofupikitsidwa zimakumana ndi hydration kuti zitsimikizire kulimba kolumikizana ndi kulimba kwa zinthuzo.Choncho, pomanga chilimwe chotentha kwambiri, kuti akwaniritse zotsatira za kusunga madzi, mankhwala apamwamba a HPMC ayenera kuwonjezeredwa muyeso wokwanira malinga ndi chilinganizo, apo ayi, osakwanira hydration, kuchepetsa mphamvu, kusweka, dzenje ndi kugwa chifukwa. mwa kuyanika kwambiri kudzachitika.Zimawonjezeranso zovuta zomanga kwa ogwira ntchito.Pamene kutentha kumachepa, kuchuluka kwa HPMC kuwonjezeredwa kungathe kuchepetsedwa pang'onopang'ono, ndipo zotsatira zofanana zosungira madzi zimatha kupezeka.