Zomwe zimayambitsa thovu ndi zabwino ndi zoyipa za thovu pakugwiritsa ntchito zinthu za cellulose ether

Mankhwala a cellulose ether HPMC ndi HEMC ali ndi magulu onse a hydrophobic ndi hydrophilic. Gulu la methoxy ndi hydrophobic, ndipo gulu la hydroxypropoxy ndi losiyana malinga ndi malo olowa m'malo. Ena ndi hydrophilic ndipo ena ndi hydrophobic. Hydroxyethoxy ndi hydrophilic. Zomwe zimatchedwa hydrophilicity zikutanthauza kuti ili ndi malo okhala pafupi ndi madzi; hydrophobicity imatanthauza kuti ili ndi katundu wothamangitsa madzi. Popeza mankhwalawa ndi hydrophilic ndi hydrophobic, mankhwala a cellulose ether amakhala ndi ntchito yapamtunda, yomwe imapanga thovu la mpweya. Ngati chimodzi mwazinthu ziwirizi ndi hydrophilic kapena hydrophobic, palibe thovu lomwe lingapangidwe. Komabe, HEC ili ndi gulu la hydrophilic la gulu la hydroxyethoxy ndipo ilibe gulu la hydrophobic, kotero silingapange thovu.

The kuwira chodabwitsa komanso mwachindunji zokhudzana ndi Kutha mlingo wa mankhwala. Ngati mankhwalawo asungunuka pamlingo wosagwirizana, thovu lidzapanga. Nthawi zambiri, kutsika kwa mamasukidwe akayendedwe, m'pamenenso kusungunuka kwachangu. Kukwera mamasukidwe akayendedwe, ndi pang'onopang'ono Kusungunuka mlingo. Chifukwa china ndi vuto la granulation, granulation ndi yosagwirizana (kukula kwa tinthu si yunifolomu, pali zazikulu ndi zazing'ono). Zimapangitsa kuti nthawi yosungunuka ikhale yosiyana, imapanga kuwira kwa mpweya.

Ubwino wa thovu la mpweya ukhoza kuonjezera malo a batch scraping, malo omanga amakonzedwanso bwino, slurry ndi yopepuka, ndipo batch scraping ndiyosavuta. Choyipa ndichakuti kukhalapo kwa thovu kumachepetsa kuchuluka kwa zinthuzo, kuchepetsa mphamvu, komanso kukhudza kukana kwanyengo kwazinthuzo.