1. Mawu Oyamba
Hydroxypropyl Methylcellulose (HPMC) ndi polima wosungunuka m'madzi womwe umagwiritsidwa ntchito kwambiri popangira zokutira, zomangira, zamankhwala ndi zina. M'makampani okutira, HPMC simangogwiritsidwa ntchito ngati thickener, stabilizer ndi filimu kale, komanso ngati dispersant kwambiri imayenera. Ntchito zake zazikulu mu zokutira zimaphatikizapo kukonza kukhazikika kwa zokutira, kukonza ma rheology, kupititsa patsogolo ntchito yomanga komanso mtundu wa zokutira zomaliza.
2. Makhalidwe a HPMC
Mapangidwe a maselo a HPMC amakhala ndi mafupa a cellulose ndi hydroxypropyl ndi methyl substituents. Kapangidwe kake kapadera kamapereka kusungunuka kwa HPMC m'madzi ndikutha kupanga yankho la viscoelastic munjira yamadzi. HPMC imalumikizana ndi mamolekyu osungunulira kudzera pa hydrogen bonding ndi mphamvu za van der Waals, potero amasungunuka m'madzi ndikupanga njira yobalalika yokhazikika.
Kulemera kwa mamolekyulu ndi digiri ya kusintha (DS) ya HPMC kumakhudza kusungunuka kwake ndi kukhuthala kwake. Nthawi zambiri, kulemera kwakukulu kwa maselo ndi kuchuluka kwa m'malo kumawonjezera kukhuthala ndi kutha kwa nthawi ya HPMC. Makhalidwewa ndi ofunikira pa ntchito ya HPMC ngati dispersant ❖ kuyanika.
3. Udindo wa HPMC mu zokutira
3.1 Kusintha pigment dispersibility
HPMC zimagwiritsa ntchito kusintha dispersibility wa inki mu zokutira. Popanga zokutira, kuphatikizika kwa pigment particles ndi vuto wamba, lomwe limatsogolera ku zokutira zosagwirizana komanso zosakhazikika, zomwe zimakhudza gloss ndi mtundu wofanana wa zokutira. Ma dispersants a HPMC amagwira nawo mbali zotsatirazi:
Electrostatic repulsion: Yankho lopangidwa ndi HPMC kusungunuka m'madzi limakhala ndi ntchito yayikulu padziko lapansi ndipo limatha kujambulidwa pamwamba pa tinthu tating'ono ta pigment kuti tipereke. Izi electrostatic repulsion amalekanitsa pigment particles wina ndi mzake ndi kumachepetsa agglomeration.
Steric cholepheretsa zotsatira: The polima unyolo wa HPMC akhoza kupanga wosanjikiza zoteteza padziko pigment particles, kuonjezera malo mtunda pakati pa particles, motero ziletsa kukopana ndi agglomeration pakati particles.
Kukhazikika kwamphamvu: HPMC imaphatikizana ndi mamolekyu amadzi kudzera mu zomangira za haidrojeni kuti apange njira yokhazikika yothetsera, kuteteza tinthu tating'ono ta pigment kuti zisakhazikike mu dongosolo, ndikuwongolera kukhazikika kwa ❖ kuyanika.
3.2 Kupititsa patsogolo rheology
Ntchito ina yofunika ya HPMC ndi kusintha rheology zokutira, ndiko kuti, otaya ndi mapindikidwe makhalidwe zokutira. Ubwino wa rheological wa zokutira umathandizira kuti pakhale kufalikira kwabwino komanso kusanja panthawi yomanga, kupanga filimu yopaka yunifolomu. HPMC imakhudza rheological katundu ❖ kuyanika kudzera njira zotsatirazi:
Kukweza kwa Viscoelasticity: Mapangidwe a netiweki ya polima opangidwa ndi HPMC m'madzi amapatsa yankho kukhuthala kwina. Viscoelasticity iyi imatha kusintha kayendedwe ka zokutira, kuti ikhale ndi mamasukidwe oyenera potsuka, kuchepetsa kugwa ndi kudontha.
Kumeta ubweya wa ubweya: Mayankho a HPMC nthawi zambiri amawonetsa kumeta ubweya wa ubweya, ndiko kuti, amakhala ndi mamasukidwe apamwamba pamitengo yotsika yometa ubweya komanso kutsika kwa mamachulukidwe okwera kwambiri. Katunduyu amapangitsa kuti zokutirazo zikhale zokhazikika pamalo okhazikika komanso zosavuta kufalikira pomanga.
Thixotropy: Mayankho ena a HPMC amawonetsanso thixotropy, ndiko kuti, kukhuthala kumabwezeretsedwa pakupuma, komwe kuli kofunikira kwambiri pakuchepetsa kutsika ndi kudontha kwa zokutira.
3.3 Kupititsa patsogolo ntchito zokutira
HPMC sikuti imangokhala ndi chikoka chofunikira pakuchita kwa zokutira pakumanga, komanso imapangitsanso bwino kwambiri zokutira komaliza. HPMC imathandizira magwiridwe antchito a zokutira pazinthu izi:
Kuphimba kusalala: HPMC imapangitsa kuti zokutira zikhale bwino, zimathandizira kufalikira ndi kusinthasintha kwa zokutira, ndipo zimapangitsa kuti zokutira zikhale zosalala komanso zofananira.
Kukana madzi ndi kukana kwanyengo: HPMC imapanga mawonekedwe olimba a netiweki mu zokutira, zomwe zimawonjezera kukana kwamadzi ndi kuthekera koletsa kukalamba kwa zokutira, ndikuwongolera kukana kwanyengo kwa zokutira.
Kumamatira: HPMC kumawonjezera zomatira kwa ❖ kuyanika, kotero kuti ❖ kuyanika akhoza kukhala molimba Ufumuyo pamwamba pa gawo lapansi, ndi bwino durability wa ❖ kuyanika.
4. Zitsanzo zogwiritsira ntchito HPMC
4.1 Zotchingira Zomanga
Mu zokutira zomangamanga, HPMC imagwiritsidwa ntchito popititsa patsogolo kufalikira kwa ma pigment ndi ma rheology a zokutira, makamaka zokutira zotengera madzi. HPMC imathandizira kukhazikika ndi ntchito yomanga ya zokutira, kuti zokutirazo zikhale zokhazikika bwino komanso kumamatira pakhoma, ndikuletsa filimuyo kuti isagwere komanso kuyanika mosiyanasiyana.
4.2 zokutira mafakitale
HPMC amagwiritsidwanso ntchito kwambiri mu zokutira mafakitale. Izo osati bwino dispersibility wa inki, komanso bwino ntchito yomanga zokutira, kupanga ❖ kuyanika filimu kwambiri kutsatira zitsulo, pulasitiki ndi magawo ena, ndipo anapanga ❖ kuyanika filimu cholimba.
4.3 Zopaka zina
HPMC imagwiritsidwanso ntchito pazovala zapadera zosiyanasiyana, monga zokutira zoziziritsa moto, zokutira zotsutsana ndi dzimbiri, ndi zina zambiri. Udindo wake pazovala izi makamaka kupititsa patsogolo kukhazikika kwa zokutira ndi filimu yophimba, kuti zokutira zizikhala bwino mu zosiyanasiyana zovuta mapangidwe.
Monga dispersant ❖ kuyanika, HPMC imagwira ntchito yofunika kwambiri pokonza dispersibility wa inki, kukonzanso rheology zokutira ndi kupititsa patsogolo mafilimu ❖ kuyanika. Mapangidwe ake apadera ndi ntchito zake zimapatsa mwayi wosiyanasiyana wogwiritsa ntchito pamakampani opanga zokutira. Ndi chitukuko cha ukadaulo wokutira, kugwiritsa ntchito kwa HPMC kupitilira kukula, ndikupereka mwayi wowonjezera komanso kuwongolera magwiridwe antchito.
Nthawi yotumiza: Jun-25-2024