Hydroxyethyl Cellulose (HEC) ndi polima yosungunuka m'madzi yopanda ionic yomwe mawonekedwe ake amasinthidwa kuchokera ku cellulose kudzera mu hydroxyethylation reaction. HEC ili ndi kusungunuka kwamadzi kwabwino, kukhuthala, kuyimitsa, emulsifying, kufalitsa ndi kupanga mafilimu, kotero imagwiritsidwa ntchito kwambiri muzomangamanga, zokutira, mankhwala a tsiku ndi tsiku ndi mafakitale a chakudya. Popaka utoto wopopera-woyika mwachangu pamiyala yopanda madzi, kuyambitsa kwa cellulose ya hydroxyethyl kumatha kusintha kwambiri kukana kwake kutentha.
1. Basic katundu wa hydroxyethyl mapadi
Hydroxyethylcellulose imakhala ndi mphamvu zolimbitsa thupi komanso kupanga mafilimu m'madzi, zomwe zimapangitsa kuti zikhale zokometsera bwino zopaka zosiyanasiyana zamadzi. Zimawonjezera kukhuthala kwa utoto popanga ma hydrogen zomangira ndi mamolekyu amadzi, zomwe zimapangitsa kuti maukonde amadzimadzi azikhala olimba. Katunduyu ndi wofunikira kwambiri pazovala zopanda madzi, chifukwa kukhuthala kwakukulu kumathandizira kuti chophimbacho chikhalebe ndi mawonekedwe ake ndi makulidwe ake asanachiritsidwe, kuonetsetsa kuti filimuyo ikugwirizana ndi kupitilira.
2. Njira zothandizira kutentha kukana
2.1 Wonjezerani kukhazikika kwa zokutira
Kukhalapo kwa cellulose ya hydroxyethyl kumatha kupititsa patsogolo kukhazikika kwamafuta a zokutira zalabala. Kukhuthala kwa utoto kumachepa kutentha kukakwera, ndipo hydroxyethyl cellulose imachepetsa njirayi ndikusunga mawonekedwe ake. Izi zili choncho chifukwa gulu la hydroxyethyl mu molekyulu ya HEC likhoza kupanga maukonde okhudzana ndi thupi ndi zigawo zina muzovala, zomwe zimapangitsa kuti filimuyo ikhale yokhazikika komanso imapangitsa kuti ikhale yabwino komanso ikugwira ntchito pansi pa kutentha kwakukulu.
2.2 Kupititsa patsogolo makina a filimu yokutira
The makina katundu ❖ kuyanika filimu, monga kusinthasintha, kumangika mphamvu, etc., mwachindunji zimakhudza ntchito yake pansi pa kutentha kwambiri. Kuyamba kwa HEC kumatha kupititsa patsogolo makina a filimu yophimba, yomwe makamaka chifukwa cha kukhuthala kwake komwe kumapangitsa kuti filimu yokutira ikhale yovuta kwambiri. Mawonekedwe a filimu yokutira wandiweyani sikuti amangowonjezera kukana kutentha, komanso amathandizira kukana kupsinjika kwakuthupi komwe kumayambitsidwa ndi kufalikira kwakunja kwa kutentha ndi kutsika, kuteteza kusweka kapena kusenda kwa filimu yokutira.
2.3 Limbikitsani kumamatira kwa filimu yokutira
Pansi pa kutentha kwakukulu, zokutira zopanda madzi zimakhala zosavuta ku delamination kapena peeling, zomwe zimachitika makamaka chifukwa cha kusagwirizana kokwanira pakati pa gawo lapansi ndi filimu yophimba. HEC ikhoza kupititsa patsogolo kumamatira kwa zokutira ku gawo lapansi popititsa patsogolo ntchito yomanga ndi kupanga mafilimu a zokutira. Izi zimathandiza zokutira kuti zigwirizane kwambiri ndi gawo lapansi pa kutentha kwakukulu, kuchepetsa chiopsezo cha peeling kapena delamination.
3. Deta yoyesera ndi ntchito zothandiza
3.1 Mapangidwe oyesera
Pofuna kutsimikizira mphamvu ya hydroxyethyl mapadi pa kutentha kukana kwa sprayed mofulumira-kukhazikitsa mphira phula phula ❖ kuyanika madzi, angapo zoyesera zikhoza kupangidwa. Poyesera, zinthu zosiyanasiyana za HEC zitha kuwonjezeredwa ku zokutira zopanda madzi, ndiyeno kukhazikika kwamafuta, zida zamakina ndi kumamatira kwa zokutira zitha kuyesedwa kudzera mu kusanthula kwa thermogravimetric (TGA), kusanthula kwamphamvu kwa thermomechanical (DMA) ndi kuyesa kwamphamvu.
3.2 Zotsatira zoyeserera
Zotsatira zoyesera zimasonyeza kuti mutatha kuwonjezera HEC, kutentha kwa kutentha kwa chophimba kumawonjezeka kwambiri. Mu gulu lolamulira popanda HEC, filimu yokutira inayamba kuwola pa 150 ° C. Pambuyo powonjezera HEC, kutentha komwe filimu yophimbayo imatha kupirira idakwera kufika pa 180 ° C. Kuonjezera apo, kuyambika kwa HEC kunawonjezera mphamvu yowonongeka ya filimu yophimba pafupifupi 20%, pamene kuyesa kwa peeling kunasonyeza kuti kumatira kwa chophimba ku gawo lapansi kunawonjezeka ndi pafupifupi 15%.
4. Ntchito zaumisiri ndi njira zodzitetezera
4.1 Ntchito yaukadaulo
Pakugwiritsa ntchito, kugwiritsa ntchito hydroxyethyl cellulose kumatha kupititsa patsogolo ntchito yomanga komanso ntchito yomaliza ya zokutira zotchingira madzi za rabara zokhazikika. Chophimba chosinthidwachi chingagwiritsidwe ntchito m'magawo monga kumanga kutsekereza madzi, uinjiniya wapansi panthaka kutsekereza madzi, ndi anticorrosion mapaipi, ndipo ndizofunikira makamaka pakuletsa madzi m'malo otentha kwambiri.
4.2 Kusamala
Ngakhale HEC ikhoza kupititsa patsogolo kwambiri ntchito zokutira, mlingo wake uyenera kuyendetsedwa moyenera. Kuchulukitsitsa kwa HEC kungayambitse kukhuthala kwa zokutira kukhala kokwera kwambiri, zomwe zimakhudza ntchito yomanga. Chifukwa chake, pamapangidwe enieni, mlingo wa HEC uyenera kukulitsidwa kudzera muzoyeserera kuti mukwaniritse bwino kwambiri zokutira komanso zomanga.
Ma cellulose a Hydroxyethyl amathandizira bwino kukana kwa kutentha kwa zokutira zopaka phula losapaka madzi powonjezera kukhuthala kwa zokutira, kupititsa patsogolo mawonekedwe a filimu yokutira, ndikuwongolera kumamatira kwa zokutira. Deta yoyesera ndi ntchito zothandiza zimasonyeza kuti HEC ili ndi zotsatira zazikulu pakuwongolera kukhazikika kwa kutentha ndi kudalirika kwa zokutira. Kugwiritsa ntchito moyenera kwa HEC sikungangowonjezera ntchito yomanga zokutira, komanso kukulitsa kwambiri moyo wautumiki wa zokutira zopanda madzi m'malo otentha kwambiri, kupereka malingaliro ndi njira zatsopano zopangira zida zomangira madzi.
Nthawi yotumiza: Jul-08-2024