Hydroxypropyl Methylcellulose (HPMC) is an modified cellulose ether inoshandiswa zvakanyanya mukugadzirira kwemishonga, zvokudya zvinowedzera, zvekuvaka, zvizoro uye mamwe minda. HPMC ine thickening, firimu-kuumba, adhesion uye zvimwe zvinhu. Hukama huri pakati pe viscosity uye kusungirirwa kwemushonga wayo wemvura ine kukosha kukuru kune akasiyana maapplication.
Viscosity maitiro eHPMC aqueous solution
Basic maitiro
HPMC inoumba inoonekera kana translucent viscous mhinduro mushure mekunyungudika mumvura. Viscosity yaro inobatwa kwete chete nekusangana kweHPMC, asiwo nezvinhu zvakaita senge molecular uremu, substituent mhando uye tembiricha yemhinduro.
Molecular uremu: Iyo yakakura iyo molecular huremu hweHPMC, iyo yakakwira mhinduro viscosity. Izvi zvinodaro nekuti macromolecules anoumba yakanyanya kuomesesa chimiro mumhinduro, iyo inowedzera kupokana pakati pemamorekuru.
Substituent type: Chiyero che methoxy uye hydroxypropoxy substituents chinokanganisa kunyungudika uye viscosity yeHPMC. Kazhinji, kana methoxy yemukati yakakwira, solubility yeHPMC iri nani uye viscosity yemhinduro zvakare yakakwirira.
Hukama pakati pekufungisisa uye viscosity
Dilute solution stage:
Kana huwandu hweHPMC hwadzikira, kudyidzana pakati pemamorekuru hakuna simba uye mhinduro inoratidza Newtonian fluid zvivakwa, kureva kuti, viscosity inongozvimiririra kune shear rate.
Panguva ino, viscosity yemhinduro inowedzera mutsara nekuwedzera kuisa pfungwa. Uhwu hukama hwemutsara hunogona kuratidzwa neiyo nyore viscosity equation:
| Concentration (%) | Viscosity (mPa·s) |
| 0.5 | 100 |
| 1.0 | 300 |
| 2.0 | 1000 |
| 5.0 | 5000 |
| 10.0 | 20000 |
Inogona kuoneka kubva kune data kuti viscosity yeHPMC aqueous solution inowedzera exponentially nekuwedzera kwekusungwa. Kukura uku kuchaonekwa pagirafu sechikwiriso chinokwira, kunyanya munzvimbo dzakanyanya kudzika.
Kufurira zvinhu
Mhedzisiro yekushisa
Tembiricha ine mhedzisiro yakakosha pane viscosity yeHPMC mhinduro. Kazhinji kutaura, kuwedzera kwekushisa kunoderedza viscosity yemhinduro. Izvi zvinodaro nekuti kuwedzera tembiricha kunokonzera kuwedzera kwema molecular kufamba uye kunetesa kudyidzana pakati pemacheni cheni, nekudaro kuderedza viscosity.
Mhedzisiro yeshear rate
Kune yakakwira-concentration HPMC mhinduro, iyo viscosity inobatwawo neshear rate. Pakukwirira kweshear mazinga, kutaridzika kwemaketani emamorekuru kunowedzera kuenderana uye kukakavara kwemukati kunoderedzwa, zvichikonzera kuderera kunooneka viscosity yemhinduro. Chiitiko ichi chinodaidzwa kuti shear thinning.
Applications
Mukugadzirira kwemishonga, HPMC inowanzo shandiswa mumachira emapiritsi, mafomu ekuburitswa-kuburitswa kwedosi, uye makobvu. Kunzwisisa kuti viscosity yeHPMC aqueous solutions inoshanduka sei neconcentration kwakakosha pakugadzira magadzirirwo akakodzera emishonga. Semuenzaniso, mukuputira piritsi, iyo yakakodzera HPMC yekumisikidza inogona kuve nechokwadi chekuti iyo yekubikira mvura ine viscosity yakakwana yekuvhara iyo piritsi repamusoro, nepo isiri yakanyanya kukwirira kuti isanetsa kubata.
Muindasitiri yechikafu, HPMC inoshandiswa seyakakora uye inodzikamisa. Kunzwisisa hukama pakati pekutarisa uye viscosity kunogona kubatsira kuona iyo yakakwana yekuisa kuti ive nechokwadi chekunaka uye kuumbwa kwechikafu.
Iyo viscosity yeHPMC aqueous mhinduro ine kwakakosha yakanaka kuwirirana nekufungisisa. Inoratidza mutsara wekuwedzera mune dilute mhinduro nhanho uye kuwedzera exponential mukukwirira kwepamusoro. Iyi viscosity hunhu yakakosha mumhando dzakasiyana dzemaindasitiri ekushandisa, uye kunzwisisa nekudzora viscosity shanduko yeHPMC yakakosha zvikuru pakuita optimization uye kugadzirisa kunaka kwechigadzirwa.
Nguva yekutumira: Jul-08-2024