HydroxyPropyyl methylcellose (HPMC) yog ntau cov kev lag luam polymer polmer siv nyob rau hauv ntau yam lag luam, khoom noj, tsim thiab tshuaj pleev ib ce. Ib qho tseem ceeb ntawm cov khoom siv, tshwj xeeb yog siv nyob rau hauv ntau daim ntawv thov, yog nws cov quav. Cov nplaim hluav taws yog hais txog kev muaj peev xwm ntawm cov tshuaj rau qhov zes thiab txuas ntxiv mus hlawv qee cov xwm txheej. Nyob rau hauv rooj plaub ntawm HPMC, nws yog feem ntau suav hais tias yog tsis muaj teeb meem tsawg heev. Txawm li cas los xij, nws yog ib qho tsim nyog los tshawb nrhiav qhov no kom nkag siab txog nws cov nplaim taws, nws tus cwj pwm nyob rau hauv ntau yam kev mob thiab kev txiav txim siab muaj kev nyab xeeb cuam tshuam nrog nws siv.
1. Dememical qauv:
HPMC yog ib nrab hluavtaws polymer muab tau los ntawm cellulose, lub ntuj muaj zog pom hauv tsob ntoo cell. HydroxyPropyl yog taw qhia los ntawm kev txhim kho tshuaj lom neeg los txhim kho cov dej solubility thiab lwm yam khoom ntawm cellulose. Cellulose nws tus kheej tsis yog flammable heev, thiab nws tsis meej txawm tias cov kev qhia ntawm cov pab pawg tshuaj muaj ntau ntxiv. Tus qauv tshuaj ntawm HPMC qhia tias nws tsis muaj cov nplaim hluav taws muaj hluav taws xob feem ntau cuam tshuam nrog cov organic sib txuas.
2. Thermograveimetric (TGA):
TGA yog cov txheej txheem siv los kawm cov thermal ruaj thiab decomposition cov khoom siv. Kev tshawb fawb ntawm HPMC siv TGA tau qhia tias feem ntau yog underganes thermal degradation ua ntej mus txog nws taw tes yam tsis tau ua yeeb yam khiav tawm hauv cov txaj muag. Cov khoom siv decomposition feem ntau yog dej, carbon dioxide, thiab lwm yam tsis muaj pa taws.
3. Ignition kub:
Igitionition kub yog qhov ntsuas kub qis tshaj plaws ntawm uas ib qho khoom muaj peev xwm zes thiab txhawb nqa kev sib txuas. HPMC muaj qhov kub siab dua thiab kub thiab txias dua thiab tsis tshua muaj qhov chaw nres tsheb. Qhov tseeb kub yuav sib txawv raws li qib tshwj xeeb thiab kev ua yeeb yam ntawm HPMC.
4. Liming oxygen Performance index (Loi):
Loi yog kev ntsuas ntawm cov ntaub ntawv cov nplaim taws, ntsuas raws li cov oxygen yam tsawg kawg yuav tsum txhawb kev sib txuas. Ntau dua loi muaj nuj nqis qhia qis dua cov nplaim taws. HPMC feem ntau muaj ntau dua loi, qhia tias nws cov kev sib txuas lus yuav tsum tau muaj kev sib txuam ntau ntawm cov pa oxygen.
5. Cov ntawv thov siv:
HPMC feem ntau siv hauv kev lag luam kws tshuaj, uas nruj tus qauv kev nyab xeeb yog qhov tseem ceeb. Nws cov roj ntsha me me ua rau nws xaiv thawj qhov kev xaiv uas hluav taws kub muaj kev txhawj xeeb. Ib qho ntxiv, HPMC yog siv rau hauv cov khoom tsim khoom xws li cement-raws cortars, qhov chaw uas tsis yog-yaam hluav taws xob yog qhov zoo.
6. Kev nyab xeeb ceev faj:
Thaum HPMC nws tus kheej tsis yog flammed, cov qauv ua tiav thiab cov kev ntxiv ntxiv yuav tsum tau txiav txim siab. Qee cov txuj ci ntxiv yuav muaj cov yam ntxwv zoo sib txawv. Kev tswj hwm kom zoo thiab kev khaws cia yuav tsum tau ua raws li cov neeg ua haujlwm kev nyab xeeb thiab tiv thaiv hluav taws kub.
7. Cov kev cai thiab cov qauv:
Ntau lub koom haum cov koom haum, xws li FDA (cov koomhaum thiab lwm cov koom haum thiab tshuaj rau cov txheej txheem thoob ntiaj teb, muaj cov lus qhia txog kev siv cov ntaub ntawv sib txawv. Cov kev cai no feem ntau suav nrog kev ntsuas kev nyab xeeb ntawm kev nyab xeeb ntawm kev nyab xeeb. Ua raws li cov cai no ua kom ntseeg tau tias cov khoom uas muaj HPMC ua tau raws li cov qauv kev nyab xeeb.
HPMC yog feem ntau suav hais tias tsis muaj peev xwm lossis muaj cov nplaim taws tsawg dua. Nws cov qauv tshuaj, kev kub siab kub thiab txias thiab lwm yam hluav taws xob ua rau nws muaj kev nyab xeeb hauv ntau cov ntawv thov. Txawm li cas los xij, cov qauv ua tiav thiab cov kev ntxiv ntxiv yuav tsum tau txiav txim siab thiab cov kev cai kev nyab xeeb ib txwm ua kom muaj lub luag haujlwm thiab kev nyab xeeb HPMC hauv kev lag luam sib txawv.
Lub Sijhawm Post: Feb-19-2025