HPMC tuaj yeem yaj nyob rau hauv cov kuab tshuaj tov nrog dej txias thiab cov organic teeb meem los tsim cov kua nplaum pob tshab. Cov tshuaj aqueous muaj cov dej num saum npoo av, siab transparency thiab muaj zog stability. Nws qhov kev sib cais hauv dej tsis cuam tshuam los ntawm pH. Nws muaj thickening thiab anti-freezing teebmeem nyob rau hauv zawv plaub hau thiab da dej gel, thiab muaj dej tuav thiab zoo zaj duab xis-tsim zog rau cov plaub hau thiab tawv nqaij. Nrog rau kev nce ntau ntawm cov khoom siv raw, cellulose (antifreeze thickener) tuaj yeem txo tus nqi thiab ua tiav cov txiaj ntsig zoo thaum siv tshuaj zawv plaub hau thiab da dej gel.
Cov tshuaj txhua hnub qib dej txias instant hydroxypropyl methyl cellulose muaj cov khoom nram qab no:
1. Cov dej tuav tau zoo heev. HPMC muaj cov yam ntxwv hydrophilic. Nws tuaj yeem tuav cov dej khaws cia siab hauv cov khoom muab tshuaj txhuam, muab tshuaj txhuam thiab muab tshuaj txhuam.
2. Cov dej txias instant hydroxypropyl methylcellulose HPMC siv cov khoom siv ntuj tsim, uas muaj kev ua haujlwm me me, tsis tshua muaj khaus, kev tiv thaiv ib puag ncig thiab kev nyab xeeb.
3. PH yog qhov ruaj khov, thiab cov viscosity ntawm aqueous tov feem ntau ruaj khov nyob rau hauv thaj tsam ntawm pH3.0 txog 11.0.
4. Cov tshuaj aqueous ntawm cov khoom muaj kev ua haujlwm saum npoo, emulsification, kev tiv thaiv colloid thiab txheeb ze stability. Nws qhov nro saum npoo yog li 2% thiab cov tshuaj aqueous yog 42-56dyn / cm.
5. Thickening thiab dej solubility, nws tuaj yeem yaj sai sai hauv dej txias, qee cov organic solvents thiab sib tov nrog cov kuab tshuaj organic.
6. Ua kom muaj viscosity: thaum me me ntawm kev sib cais yog nce, cov kua nplaum pob tshab yuav raug tsim, uas muaj cov yam ntxwv ntawm kev ua haujlwm ruaj khov thiab siab transparency. Lub solubility yuav hloov nrog lub viscosity. Qhov qis dua qhov viscosity, qhov ntau dua qhov kev sib cais, uas tuaj yeem txhim kho qhov txaus siab ntawm qhov system.
7. Cov ntsev zoo heev. HPMC yog ib qho uas tsis yog-ionic polymer, uas yog ruaj khov nyob rau hauv cov organic electrolyte aqueous tov los yog organic electrolyte.
8. Thermal gelation: thaum lub aqueous tov yog rhuab mus rau ib tug tej yam kub, nws yuav opaque mus txog rau thaum ib tug flocculation lub xeev generated, uas yuav ua rau cov tshuaj poob nws vim viscosity. Txawm li cas los xij, nws yuav hloov mus rau qhov kev daws teeb meem qub tom qab txias. Rau qhov teeb meem ntawm thermal gel, qhov kub thiab txias feem ntau yog nyob ntawm cov khoom lag luam, kev daws teeb meem thiab cua sov tus nqi.
9. HPMC muaj lwm yam khoom siv hauv kev siv tshuaj lom neeg txhua hnub, xws li cov yeeb yaj kiab zoo tshaj plaws, cov enzyme uas nws kim heev, dispersion thiab bonding zog.
Post lub sij hawm: Lub Xya hli ntuj-29-2022