Hydroxypropyl methylcellulose (HPMC) yog cov khoom siv polymer uas muaj ntau yam siv ntau yam lag luam, suav nrog tshuaj, khoom noj, kev tsim kho, thiab tshuaj pleev ib ce. Ib qho tseem ceeb ntawm nws daim ntawv thov yog nws cov solubility hauv cov kuab tshuaj sib txawv, suav nrog isopropyl cawv (IPA).
HPMC feem ntau yog soluble nyob rau hauv ntau yam kuab tshuaj, thiab nws solubility nws txawv nyob ntawm seb yam xws li molecular hnyav, degree ntawm hloov, thiab kub. HPMC muaj qee qhov kev solubility nyob rau hauv cov ntaub ntawv ntawm isopropyl cawv.
Isopropyl cawv, tseem hu ua kua dej cawv, yog ib qho hnyav uas siv ntau yam kev siv. Nws yog lub npe hu rau nws lub peev xwm los yaj ntau yam ntawm cov tshuaj, thiab HPMC tsis muaj kev zam. Txawm li cas los xij, kev solubility ntawm HPMC hauv isopropyl cawv yuav tsis ua tiav lossis sai sai thiab nws yuav nyob ntawm ntau yam.
Qib ntawm kev hloov pauv ntawm HPMC yog hais txog qib kev hloov pauv ntawm hydroxypropyl thiab methyl pawg rau hydroxyl pawg hauv cov qauv cellulose. Qhov kev ntsuas no cuam tshuam rau kev solubility ntawm HPMC hauv cov kuab tshuaj sib txawv. Feem ntau, qib siab dua ntawm kev hloov pauv tuaj yeem txhim kho solubility hauv qee cov kuab tshuaj, suav nrog isopropyl cawv.
Qhov hnyav molecular ntawm HPMC yog lwm qhov yuav tsum tau xav txog. Qhov hnyav dua molecular HPMC tuaj yeem muaj cov khoom sib txawv ntawm cov khoom sib txawv piv rau cov qauv qis dua molecular. Nws yog ib qho tsim nyog sau cia tias muaj ntau qib ntawm HPMC nyob rau hauv kev ua lag luam nrog cov khoom sib txawv, thiab cov chaw tsim khoom feem ntau muab cov lus qhia tshwj xeeb ntawm lawv cov solubility hauv cov kuab tshuaj sib txawv.
Kub kuj tseem cuam tshuam qhov solubility ntawm HPMC hauv isopropyl cawv. Feem ntau hais lus, qhov kub thiab txias tuaj yeem txhim kho cov solubility ntawm cov tshuaj feem ntau, tab sis qhov no yuav txawv nyob ntawm seb cov qib polymer tshwj xeeb.
Txhawm rau yaj HPMC hauv isopropyl cawv, koj tuaj yeem ua raws li cov kauj ruam no:
Ntsuas tus nqi yuav tsum tau: Txiav txim seb tus nqi HPMC xav tau rau koj daim ntawv thov.
Npaj cov kuab tshuaj: Siv lub thawv tsim nyog thiab ntxiv qhov xav tau ntawm isopropyl cawv. Nws raug nquahu kom siv lub thawv nrog lub hau kom tiv thaiv evaporation.
Ntxiv HPMC Maj mam: Thaum nplawm lossis nplawm cov kuab tshuaj, maj mam ntxiv HPMC. Nco ntsoov sib tov kom huv si los txhawb kev sib cais.
Kho cov xwm txheej yog tias tsim nyog: Yog tias tsis ua tiav qhov kev sib cais tiav, xav txog kev hloov kho yam xws li kub lossis siv qib sib txawv ntawm HPMC.
Lim yog tsim nyog: qee zaum, cov khoom uas tsis tau yaj tuaj yeem tshwm sim. Yog tias pob tshab yog qhov tseem ceeb, koj tuaj yeem lim cov tshuaj kom tshem tawm cov khoom seem seem.
HPMC feem ntau yog soluble hauv isopropyl cawv, tab sis qib ntawm solubility cuam tshuam los ntawm yam xws li kev hloov pauv, qhov hnyav molecular, thiab kub. Yog tias koj muaj qib tshwj xeeb lossis hom HPMC, nws raug nquahu kom kuaj xyuas cov chaw tsim khoom cov lus qhia kom paub tseeb cov ntaub ntawv ntawm isopropyl cawv solubility.
Post lub sij hawm: Jan-25-2024