Hydroxypropyl methylcellulose (HPMC) ndi non-ionic cellulose ether yomwe imagwiritsidwa ntchito kwambiri muzomangamanga, makamaka muzitsulo zowuma zowuma. Chakhala chowonjezera chachikulu chifukwa cha mawonekedwe ake abwino kwambiri opanga mafilimu, kusunga madzi, kukhuthala ndi zina.
1. Makina opanga mafilimu a HPMC
HPMC ali wabwino kusungunuka madzi ndipo alipo ngati polima omwazikana mu madzi gawo mu matope. Mtondo ukayamba kuthira madzi ndi kuumitsa pambuyo kusanganikirana, mamolekyu a HPMC pang'onopang'ono amasonkhanitsidwa ndikulumikizana ndi evaporation yamadzi, ndipo pamapeto pake amapanga filimu yopitilira polima pamwamba kapena mkati mwa matope. Wosanjikiza filimuyi amatha kukulunga tinthu tating'onoting'ono ta simenti ndikudzaza ma pores amatope, kusewera gawo lolumikizana komanso loteteza pamapangidwe onse.
Njira yopangira filimu ya HPMC imakhudzidwa ndi kutentha, chinyezi, chiŵerengero cha simenti ya madzi ndi mlingo wa HPMC. Nthawi zambiri, pa kutentha koyenera (20℃℃℃40℃) ndi chinyezi pang'ono, HPMC imatha kupanga filimu yosinthika komanso yosalekeza kuti ipititse patsogolo magwiridwe antchito onse amatope.
2. Zotsatira za filimu ya HPMC pakupanga matope
Limbikitsani kusunga madzi
Pambuyo kupanga filimu, HPMC akhoza kupanga chatsekedwa microenvironment mu matope, kuchepetsa liwiro la kusamuka madzi kunja, potero mogwira kutalikitsa simenti hydration nthawi ndi kuwongolera mlingo wa hydration. Izi zimagwira ntchito yofunika kwambiri poletsa kusweka koyambirira, kukulitsa mphamvu yolumikizana komanso kukhazikika.
Limbikitsani ntchito yomanga
Kanema wopangidwa ndi HPMC amapatsa matope mafuta abwino komanso osalala, amachepetsa zomwe zimachitika kuti matope amamatire pazida pakumanga, komanso amathandizira pakumanga. Makamaka mu zomatira matailosi, matope a pulasitala, ndi matope odzipangira okha, mawonekedwe opangira filimu amakhala ndi kusintha kwakukulu pakugwira ntchito.
Kupititsa patsogolo mgwirizano
Pambuyo pakupanga filimu, HPMC imapanga mlatho wolumikizana pakati pa matope ndi maziko kapena veneer, kupititsa patsogolo luso lomatira. Panthawi imodzimodziyo, chifukwa cha kukhalapo kwa filimu yake yotanuka, imatha kuthetsa kupsinjika maganizo, kupititsa patsogolo kukana kwa ming'alu yazitsulo zomangira, ndi kuchepetsa chiopsezo cha kugwa.
Limbikitsani kukana kwa crack ndi kusinthasintha
Kanema wa HPMC ali ndi kusinthasintha kwina komanso kusinthasintha, komwe kumatha kuyamwa bwino kupsinjika komwe kumachitika chifukwa cha kuchepa, kusintha kwa kutentha kapena kusinthika kwapansi, kuteteza kusweka kwamatope, motero kumapangitsa kukhazikika komanso kukongola.
Konzani maonekedwe a pamwamba
HPMC yopangidwa ndi filimu imatha kupangitsa kuti matope azikhala olimba komanso osalala, achepetse kutuluka kwamadzi, kuthandizira kumalizidwa kotsatira, ndikuwongolera kukongoletsa.
3. Zinthu zomwe zimakhudza kupanga mafilimu
Kulemera kwa mamolekyu ndi digiri ya kusintha
Kulemera kwa mamolekyu a HPMC kumapangitsanso mphamvu ndi kulimba pambuyo popanga filimu, koma kusungunuka kumakhala pang'onopang'ono. Mlingo wa m'malo (zomwe zili mu methoxy ndi hydroxypropyl) zimatsimikizira kutentha kwake kwa hydrophilicity ndi kupanga mafilimu. Kulowetsedwa pang'ono kumapangitsa kuti pakhale zotsatira ziwiri za kupanga mafilimu ndi kusunga madzi.
Ndalama zowonjezera
Kuchuluka kwa HPMC mumatope nthawi zambiri kumayendetsedwa pa 0.1% ~ 0.5%. Kuchuluka kwambiri kumabweretsa nthawi yokhazikika komanso kuchepa mphamvu. Zochepa kwambiri zidzapangitsa kuti filimuyi isamangidwe bwino, zomwe zimakhudza kusunga madzi ndi ntchito yomanga.
Malo omanga
Kutentha kwakukulu ndi malo owuma kumathandizira kutuluka kwa madzi, zomwe zingayambitse HPMC "kuwotchedwa youma" isanayambe kupanga filimu, zomwe zimakhudza momwe amachitira. Pomanga, chidwi chiyenera kuperekedwa pakukonza ndi kuwongolera chinyezi kuti athe kumaliza bwino ntchito yopanga filimuyo.
Ntchito yopanga mafilimu aMtengo wa HPMCmumatope ndi maziko a kukwaniritsidwa kwa ntchito zake zosiyanasiyana. Popanga filimu yopitilira polima isanawumitsidwe, HPMC imathandizira kwambiri kusungidwa kwamadzi, kugwira ntchito, kumamatira komanso kukana kwamatope. Kusankhidwa koyenera kwa chitsanzo ndi mlingo wa HPMC, ndi kukhathamiritsa kwa fomula pamodzi ndi malo enieni omanga, ndiye chinsinsi chothandizira ubwino wake wopanga mafilimu. Popanga zida zomangira zobiriwira komanso kuwongolera zofunikira pakumanga, HPMC, monga zida zosinthidwa zowoneka bwino, itenga gawo lofunikira kwambiri pantchito yomanga matope.
Nthawi yotumiza: Apr-07-2025