Mu simenti ndi matope okhala ndi gypsum, hydroxypropyl methylcellulose imagwira ntchito makamaka posunga ndi kukhuthala kwa madzi, ndipo imatha kukonza bwino kukana kwa matope ndi kukana kutsika.
Zinthu monga kutentha kwa mpweya, kutentha ndi kuthamanga kwa mphepo zimakhudza kuchuluka kwa madzi omwe amasungunuka mu simenti ndi zinthu zopangidwa ndi gypsum. Chifukwa chake, m'nyengo zosiyanasiyana, pali kusiyana pakati pa momwe madzi amasungunuka mu zinthu zomwe zimawonjezeredwa ndi kuchuluka komweko kwa hydroxypropyl methylcellulose. Pakupanga kwake, mphamvu yosungira madzi mu slurry ikhoza kusinthidwa powonjezera kapena kuchepetsa kuchuluka kwa HPMC komwe kumawonjezeredwa. Kusunga madzi pansi pa kutentha kwakukulu ndi chizindikiro chofunikira chosiyanitsa mtundu wa hydroxypropyl methylcellulose ether.
Zinthu zabwino kwambiri za hydroxypropyl methylcellulose series zimatha kuthetsa vuto la kusunga madzi pansi pa kutentha kwambiri. Mu nyengo yotentha kwambiri, makamaka m'malo otentha ndi ouma komanso kapangidwe kowonda kumbali ya dzuwa, HPMC yapamwamba imafunika kuti madzi asungidwe bwino. HPMC yapamwamba kwambiri ili ndi kufanana kwabwino kwambiri. Magulu ake a methoxy ndi hydroxypropoxy amagawidwa mofanana mu unyolo wa maselo a cellulose, zomwe zingathandize kuti maatomu a okosijeni omwe ali pa ma hydroxyl ndi ether agwirizane ndi madzi kuti apange ma hydrogen bonds. , kotero kuti madzi omasuka amakhala omangika m'madzi, kuti azitha kuwongolera bwino kutuluka kwa madzi chifukwa cha kutentha kwambiri, ndikukwaniritsa kusunga madzi ambiri.
Hydroxypropyl methylcellulose yapamwamba kwambiri imatha kufalikira mofanana komanso moyenera mu simenti ndi zinthu zopangidwa ndi gypsum, ndikukulunga tinthu tonse tolimba, ndikupanga filimu yonyowetsa, ndipo chinyezi chomwe chili pansi chimatulutsidwa pang'onopang'ono kwa nthawi yayitali, komanso hydration reaction ndi zinthu zopanda organic gelling kuti zitsimikizire kuti zinthuzo zikugwirizana komanso kuti zinthuzo zizikhala zolimba.
Chifukwa chake, pomanga nthawi yotentha kwambiri yachilimwe, kuti madzi asungidwe bwino, ndikofunikira kuwonjezera zinthu za HPMC zapamwamba mokwanira molingana ndi njira yopangira, apo ayi, sipadzakhala madzi okwanira, mphamvu yochepa, ming'alu, mabowo ndi kutayika chifukwa cha mavuto ouma kwambiri, komanso kuwonjezera zovuta zomangira. Pamene kutentha kukutsika, kuchuluka kwa HPMC komwe kumawonjezeredwa kumatha kuchepetsedwa pang'onopang'ono, ndipo zotsatira zomwezo zosungira madzi zitha kupezeka.
Nthawi yotumizira: Epulo-13-2023