Hydroxypropyl methyl cellulose mu matope owuma, kuphatikiza kwa cellulose ether ndikotsika kwambiri, koma kumatha kusintha kwambiri magwiridwe antchito amatope onyowa, ntchito yomanga matope ndi imodzi mwazowonjezera zazikulu. Tsopano, hydroxypropyl methyl cellulose yomwe imagwiritsidwa ntchito mumatope owuma a cellulose ether imakhala makamaka hydroxypropyl methyl cellulose ether (HPMC). Hydroxypropyl methyl cellulose mumatope owuma HPMC makamaka imagwira ntchito posungira madzi, kukhuthala, kupititsa patsogolo ntchito yomanga. Hydroxypropyl methylcellulose HPMC sichita nawo mankhwala aliwonse, imangogwira ntchito yothandizira. Putty ufa anawonjezera madzi, pakhoma, ndi anachita mankhwala, chifukwa pali m'badwo wa zinthu zatsopano, putty ufa pakhoma pansi pa khoma, pansi kukhala ufa, ndiyeno ntchito, izo sizilinso, chifukwa wapanga zinthu zatsopano (calcium carbonate). Zigawo zazikulu za ufa wa calcium imvi ndi: Ca(OH)2, CaO ndi kagawo kakang'ono ka CaCO3, CaO+H2O=Ca(OH)2 - Ca(OH)2+CO2=CaCO3↓+H2O phulusa la calcium m'madzi. ndi mpweya pansi zochita za CO2, mapangidwe kashiamu carbonate, ndi HPMC kokha madzi posungira, wothandiza kashiamu phulusa bwino anachita, ake sanachite nawo chilichonse anachita.
Mkulu khalidwe la hydroxypropyl methyl mapadi akhoza uniformly ndi bwino kumwazikana mu simenti matope ndi pulasitala mankhwala, ndi phukusi onse olimba particles, ndi kupanga wosanjikiza wa kunyowetsa filimu, chinyezi m'munsi kwa nthawi yaitali pang'onopang'ono anamasulidwa, ndi inorganic cementitious zinthu hydration anachita. , kuti awonetsetse mphamvu ya mgwirizano ndi mphamvu yopondereza ya zipangizo. Chifukwa chake, pakumanga kwanyengo yachilimwe, kuti mukwaniritse kusungirako madzi, muyenera kuwonjezera mankhwala apamwamba a HPMC molingana ndi chilinganizo, apo ayi, padzakhala youma mwachangu komanso chifukwa cha kuchepa kwamadzi, kuchepetsa mphamvu, kusweka, opanda kanthu. ng'oma ndi kugwa ndi mavuto ena khalidwe, komanso kuonjezera vuto la ogwira ntchito yomanga. Pamene kutentha kumachepa, kuchuluka kwa madzi omwe amawonjezeredwa ndi HPMC akhoza kuchepetsedwa pang'onopang'ono, ndipo zotsatira zofanana zosungira madzi zimatha kupezeka.
Nthawi yotumiza: Sep-16-2022