Hydroxypropyl methylcellulose (HPMC) yog ib qho polymer ntau yam uas siv tau ntau yam hauv ntau yam lag luam xws li tshuaj, kev tsim kho, khoom noj, tshuaj pleev ib ce, thiab lwm yam. Nws cov yam ntxwv thiab kev ua haujlwm sib txawv ua rau nws yog ib qho khoom muaj nqis hauv ntau yam khoom. Nov yog kev tshawb nrhiav tob txog HPMC:
1. Cov yam ntxwv ntawm HPMC:
Cov Qauv Tshuaj: HPMC yog muab los ntawm cellulose, ib qho polymer ntuj pom muaj nyob rau hauv cov nroj tsuag. Nws yog synthesized los ntawm kev hloov kho tshuaj cellulose nrog propylene oxide thiab methyl chloride. Qib ntawm kev hloov pauv ntawm hydroxypropyl thiab methoxy pawg txiav txim siab nws cov khoom.
Kev yaj tau: HPMC yaj tau hauv dej ntau qhov kub thiab txias. Kev yaj tau nyob ntawm qib kev hloov pauv thiab qhov hnyav molecular ntawm cov polymer. Cov qib hloov pauv siab dua ua rau kev yaj dej ntau ntxiv.
Viscosity: HPMC qhia txog tus cwj pwm pseudoplastic lossis shear-thinning, txhais tau tias nws cov viscosity txo qis hauv qab kev ntxhov siab shear. Qhov viscosity ntawm HPMC cov kev daws teeb meem tuaj yeem hloov kho los ntawm kev hloov kho cov yam ntxwv xws li qhov hnyav molecular, qib ntawm kev hloov pauv, thiab kev sib xyaw.
Kev Tsim Zaj Duab Xis: HPMC tsim cov zaj duab xis meej thiab yoog tau thaum pov los ntawm cov kua. Cov yam ntxwv ntawm zaj duab xis tuaj yeem hloov kho los ntawm kev kho qhov concentration ntawm polymer thiab qhov muaj cov plasticizers.
Kev ruaj khov thermal: HPMC muaj kev ruaj khov thermal zoo, nrog rau qhov kub thiab txias decomposition feem ntau siab tshaj 200 ° C. Qhov no ua rau nws haum rau ntau txoj kev ua tiav, suav nrog kev kub yaj extrusion thiab txhaj tshuaj molding.
Hydrophilicity: Vim nws qhov xwm txheej hydrophilic, HPMC tuaj yeem nqus thiab khaws cov dej ntau. Cov khoom no muaj txiaj ntsig zoo rau kev siv xws li kev tswj hwm kev tso tshuaj thiab ua tus neeg sawv cev tuab hauv cov kab ke aqueous.
Kev Sib Haum Xeeb: HPMC sib haum xeeb nrog ntau yam khoom siv, suav nrog lwm cov polymers, plasticizers, thiab cov khoom xyaw tshuaj (APIs). Qhov kev sib haum xeeb no tso cai rau cov kab ke nyuaj kom tau tsim nrog cov yam ntxwv tshwj xeeb.
Cov Khoom Uas Tsis Yog-ionic: HPMC yog cov polymer uas tsis yog-ionic, uas txhais tau tias nws tsis nqa hluav taws xob. Cov khoom no txo kev sib cuam tshuam nrog cov tsiaj uas raug them hauv cov qauv thiab txhim kho nws qhov ruaj khov hauv kev daws teeb meem.
2. HPMC cov haujlwm:
Cov Khoom Siv Sib Txuas: Hauv cov qauv tshuaj ntsiav, HPMC ua haujlwm ua cov khoom sib txuas, txhawb kev sib txuas ntawm cov khoom me me thiab ua kom lub zog ntawm cov tshuaj ntsiav ntau ntxiv. Nws kuj pab cov tshuaj ntsiav tawg tom qab noj.
Txheej Zaj Duab Xis: HPMC yog siv dav ua tus neeg sawv cev txheej zaj duab xis rau cov ntsiav tshuaj thiab cov tshuaj ntsiav. Nws tsim ib txheej tiv thaiv uas npog qhov saj thiab tsw ntawm cov tshuaj, ua kom ruaj khov, thiab yooj yim nqos.
Kev tso tawm tas mus li: HPMC tuaj yeem siv los tswj qhov kev tso tawm ntawm cov tshuaj los ntawm cov ntawv tshuaj. Los ntawm kev ua kom noo noo los ua ib txheej gel, HPMC tuaj yeem ncua kev tso tawm tshuaj thiab muab cov txiaj ntsig kho mob tas mus li.
Viscosity Modifier: Hauv cov kab ke dej, HPMC ua haujlwm ua tus hloov kho viscosity lossis thickener. Nws muab cov cwj pwm ntws pseudoplastic, txhim kho kev ruaj khov thiab kev ua haujlwm ntawm cov qauv xws li tshuaj pleev, tshuaj pleev thiab gels.
Tus neeg sawv cev rau kev ncua: HPMC yog siv los tswj cov khoom uas tsis yaj hauv cov kua dej kom ruaj khov. Nws tiv thaiv kev poob los ntawm kev ua kom cov viscosity ntawm cov theem txuas ntxiv mus thiab txhim kho cov khoom tawg.
Emulsifier: Hauv cov qauv emulsion, HPMC ua kom qhov sib txuas ntawm cov roj thiab dej ruaj khov, tiv thaiv kev sib cais thiab emulsification theem. Nws txhim kho qhov ruaj khov thiab lub neej txee ntawm cov tshuaj pleev hauv cov khoom xws li tshuaj pleev, tshuaj pleev thiab tshuaj pleev.
Kev Tsim Hydrogel: HPMC tuaj yeem tsim cov hydrogels thaum hydrated, ua rau nws muaj txiaj ntsig zoo rau kev hnav khaub ncaws qhov txhab, cov iav sib cuag, thiab cov txheej txheem xa tshuaj. Cov hydrogels no muab ib puag ncig noo noo rau kev kho qhov txhab thiab tuaj yeem thauj cov tshuaj rau kev xa mus rau hauv zos.
Tus Neeg Ua Kom Thickening: HPMC feem ntau siv ua tus neeg ua kom thickening hauv cov khoom noj xws li cov kua ntses, cov kua ntses thiab cov khoom qab zib. Nws muab cov qauv du thiab txhim kho qhov saj yam tsis hloov pauv qhov saj lossis cov khoom noj muaj txiaj ntsig.
Cov Tshuaj Ntxiv Rau Kev Tsim Kho: Hauv kev lag luam tsim kho, HPMC siv los ua tus neeg sawv cev khaws dej hauv cov cement-based mortars thiab plasters. Nws txhim kho kev ua haujlwm, kev nplaum, thiab txo qhov tawg los ntawm kev qeeb qeeb ntawm cov dej evaporation.
Kev Hloov Kho Qhov Nto: HPMC tuaj yeem hloov kho cov yam ntxwv ntawm qhov chaw ntawm cov khoom khov kho xws li ntawv, ntaub thiab ceramics. Nws txhim kho qhov kev luam tawm, kev nplaum thiab cov yam ntxwv thaiv ntawm cov txheej thiab cov yeeb yaj kiab.
Hydroxypropylmethylcellulose (HPMC) yog ib qho polymer uas muaj ntau yam khoom thiab kev ua haujlwm. Nws qhov solubility, viscosity, zaj duab xis-tsim peev xwm thiab kev sib raug zoo ua rau nws yog ib qho khoom xyaw tseem ceeb hauv ntau daim ntawv thov thoob plaws hauv kev lag luam. Txij li cov tshuaj mus rau kev tsim kho, khoom noj mus rau cov tshuaj pleev ib ce, HPMC txuas ntxiv ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua tau zoo thiab zoo ntawm cov khoom. Raws li kev tshawb fawb thiab thev naus laus zis nce qib, qhov ua tau ntau yam thiab kev siv tau ntawm HPMC yuav nthuav dav ntxiv, tsav tsheb kev tsim kho tshiab hauv kev tsim cov qauv thiab kev tsim khoom.
Lub sijhawm tshaj tawm: Lub Ob Hlis-23-2024