Hydroxypropyl methylcellulose (HPMC) ndi polima wosunthika womwe amagwiritsidwa ntchito kwambiri ngati thickener m'mafakitale osiyanasiyana monga mankhwala, zodzoladzola, chakudya, ndi zomangira.Kumvetsetsa ma rheological properties a HPMC thickener systems ndikofunikira kuti akwaniritse ntchito zawo zosiyanasiyana.
1. Makanema:
Makina a HPMC thickener amawonetsa kumeta ubweya wa ubweya, kutanthauza kukhuthala kwawo kumachepa ndi kuchuluka kwa kumeta ubweya.Katunduyu ndi wopindulitsa pamapulogalamu omwe amafunikira kugwiritsa ntchito mosavuta kapena kukonza, monga utoto ndi zokutira.
Kukhuthala kwa mayankho a HPMC kumatengera zinthu monga ndende ya polima, kulemera kwa maselo, digirii yolowa m'malo, kutentha, ndi kumeta ubweya.
Pakumeta ubweya wochepa, mayankho a HPMC amakhala ngati zakumwa zowoneka bwino zokhala ndi kukhuthala kwakukulu, pomwe pamitengo yometa ubweya wambiri, zimakhala ngati zamadzimadzi zochepa, zomwe zimathandizira kuyenda kosavuta.
2. Thixotropy:
Thixotropy amatanthauza katundu wamadzi ena kuti abwezeretse kukhuthala kwawo atayima pambuyo povutitsidwa ndi kumeta ubweya.HPMC thickener machitidwe nthawi zambiri amasonyeza khalidwe thixotropic.
Akamameta ubweya wometa ubweya, maunyolo aatali a polima amalumikizana ndikuyenda, kumachepetsa kukhuthala.Kupsinjika kwa kumeta ubweya kukasiya, maunyolo a polima pang'onopang'ono amabwerera kumayendedwe awo mwachisawawa, zomwe zimapangitsa kuti kuchuluke kuchuluke.
Thixotropy ndizofunikira muzogwiritsira ntchito monga zokutira ndi zomatira, kumene zinthuzo ziyenera kukhalabe zokhazikika panthawi yogwiritsira ntchito koma zimayenda mosavuta pansi pa kukameta ubweya.
3. Kupsinjika Maganizo:
Makina a HPMC thickener nthawi zambiri amakhala ndi kupsinjika kwa zokolola, komwe ndi kupsinjika kochepa komwe kumafunikira kuyambitsa kuyenda.Pansi pa kupsinjika uku, zinthuzo zimakhala ngati zolimba, zowonetsa zotanuka.
Kupanikizika kwa zokolola za mayankho a HPMC kumadalira zinthu monga ndende ya polima, kulemera kwa maselo, ndi kutentha.
Kupsinjika kwa zokolola ndikofunikira pakugwiritsa ntchito komwe zinthuzo ziyenera kukhalabe pamalo osayenda pansi pa kulemera kwake, monga zokutira zowongoka kapena kuyimitsidwa kwa tinthu tolimba mu utoto.
4. Kutengeka kwa Kutentha:
Kukhuthala kwa mayankho a HPMC kumatengera kutentha, kukhuthala kumachepa nthawi zambiri kutentha kumawonjezeka.Izi ndizofanana ndi mayankho a polima.
Kuzindikira kwa kutentha kumatha kukhudza kusasinthika ndi magwiridwe antchito a makina a HPMC thickener muzogwiritsa ntchito zosiyanasiyana, zomwe zimafuna kusintha kwa kapangidwe kapena kachitidwe ka magawo kuti asunge katundu wofunidwa pamitundu yosiyanasiyana ya kutentha.
5. Kudalira kwa Shear Rate:
Kukhuthala kwa mayankho a HPMC kumadalira kwambiri kumeta ubweya wa ubweya, kumeta ubweya wambiri kumatsogolera ku kutsika kwa mamachulukidwe otsika chifukwa cha kulumikizana ndi kutambasuka kwa maunyolo a polima.
Kudalira kumeta ubweya uku kumafotokozedwa kawirikawiri ndi malamulo a mphamvu kapena Herschel-Bulkley, omwe amagwirizana ndi kumeta ubweya wa ubweya ndi kumeta ubweya ndi kupsinjika maganizo.
Kumvetsetsa kudalira kwa shear ndikofunikira pakulosera ndikuwongolera machitidwe a HPMC thickener pakugwiritsa ntchito.
6. Zotsatira za Kukhazikika:
Kuchulukitsa kuchuluka kwa HPMC mu yankho kumabweretsa kuwonjezeka kwa mamasukidwe akayendedwe komanso kupsinjika.Izi ndende zotsatira n'kofunika kukwaniritsa kugwirizana anakhumba ndi ntchito zosiyanasiyana ntchito.
Komabe, pakukhazikika kwambiri, mayankho a HPMC amatha kuwonetsa machitidwe ngati gel, kupanga mawonekedwe apakanema omwe amawonjezera kukhuthala komanso kupsinjika.
7. Kusakaniza ndi kubalalitsidwa:
Kusanganikirana koyenera ndi kubalalitsidwa kwa HPMC mu njira ndikofunikira kuti tikwaniritse kukhuthala kofananira ndi rheological katundu mu dongosolo lonse.
Chosakwanira kubalalitsidwa kapena agglomeration wa HPMC particles kungachititse kuti sanali yunifolomu mamasukidwe akayendedwe ndi kusokoneza ntchito ntchito monga zokutira ndi zomatira.
Njira zingapo zosakanikirana ndi zowonjezera zitha kugwiritsidwa ntchito kuti zitsimikizire kubalalitsidwa bwino komanso magwiridwe antchito a HPMC thickener system.
The rheological katundu wa HPMC thickener kachitidwe, kuphatikizapo mamasukidwe akayendedwe, thixotropy, zokolola nkhawa, kutentha tilinazo, kukameta ubweya mlingo kudalira, ndende zotsatira, ndi kusanganikirana/kubalalitsidwa khalidwe, amathandiza kwambiri kudziwa ntchito yawo zosiyanasiyana ntchito.Kumvetsetsa ndikuwongolera zinthuzi ndikofunikira popanga zinthu zopangidwa ndi HPMC mosasinthasintha, kukhazikika, ndi magwiridwe antchito.
Nthawi yotumiza: May-08-2024