Hydroxypropyl Methylcellulose (HPMC)thiabMethylcellulose (MC)yog ob hom cellulose derivatives, uas muaj qee qhov sib txawv hauv cov qauv tshuaj, cov khoom thiab kev siv. Txawm hais tias lawv cov qauv molecular zoo sib xws, ob qho tib si tau txais los ntawm kev hloov kho tshuaj sib txawv nrog cellulose ua cov pob txha yooj yim, tab sis lawv cov khoom thiab kev siv sib txawv.
1. Qhov sib txawv ntawm cov qauv tshuaj
Methylcellulose (MC): Methylcellulose yog tau los ntawm kev qhia methyl (-CH₃) pawg rau hauv cellulose molecules. Nws cov qauv yog los qhia methyl pawg rau hauv hydroxyl (-OH) pawg ntawm cellulose molecules, feem ntau hloov ib lossis ntau pawg hydroxyl. Cov qauv no ua rau MC muaj qee yam dej solubility thiab viscosity, tab sis qhov tshwj xeeb tshwm sim ntawm solubility thiab cov khoom raug cuam tshuam los ntawm qib ntawm methylation.
Hydroxypropyl Methylcellulose (HPMC): HPMC yog ib qho kev hloov kho ntxiv ntawm methylcellulose (MC). Raws li MC, HPMC qhia txog hydroxypropyl (-CH₂CH(OH)CH₃) pawg. Kev taw qhia ntawm hydroxypropyl zoo heev txhim kho nws cov solubility hauv dej thiab txhim kho nws cov thermal stability, pob tshab thiab lwm yam khoom ntawm lub cev. HPMC muaj ob qho tib si methyl (-CH₃) thiab hydroxypropyl (-CH₂CH(OH)CH₃) pawg hauv nws cov qauv tshuaj, yog li nws yog dej-soluble ntau dua li MC ntshiab thiab muaj thermal stability ntau dua.
2. Solubility thiab hydration
Solubility ntawm MC: Methylcellulose muaj qee yam solubility hauv dej, thiab solubility nyob ntawm qib ntawm methylation. Feem ntau, methylcellulose muaj solubility tsawg, tshwj xeeb tshaj yog nyob rau hauv dej txias, thiab nws yog ib qho tsim nyog los ua kom sov cov dej los txhawb nws cov kev sib cais. Cov yaj MC muaj viscosity ntau dua, uas kuj yog ib qho tseem ceeb hauv ntau daim ntawv thov kev lag luam.
Solubility ntawm HPMC: Hauv qhov sib piv, HPMC muaj cov dej solubility zoo dua vim yog kev qhia txog hydroxypropyl. Nws tuaj yeem yaj sai sai hauv dej txias, thiab nws qhov kev sib cais sai dua MC. Vim tias muaj kev cuam tshuam ntawm hydroxypropyl, qhov solubility ntawm HPMC tsis yog tsuas yog txhim kho hauv cov dej txias, tab sis kuj nws qhov ruaj khov thiab pob tshab tom qab tawg tau zoo dua. Yog li, HPMC yog qhov tsim nyog rau cov ntawv thov uas xav tau kev sib cais sai.
3. Thermal stability
Thermal stability ntawm MC: Methylcellulose tsis zoo thermal stability. Nws solubility thiab viscosity yuav hloov tau zoo heev ntawm qhov kub thiab txias. Thaum qhov kub thiab txias, qhov kev ua tau zoo ntawm MC yog yooj yim cuam tshuam los ntawm thermal decomposition, yog li nws daim ntawv thov nyob rau hauv qhov kub thiab txias ib puag ncig yog raug rau qee yam kev txwv.
Thermal stability ntawm HPMC: Vim yog kev taw qhia ntawm hydroxypropyl, HPMC muaj thermal stability zoo dua MC. HPMC qhov kev ua tau zoo yog qhov ruaj khov ntawm qhov kub siab dua, yog li nws tuaj yeem tswj tau cov txiaj ntsig zoo hauv qhov kub ntau dua. Nws thermal stability ua rau nws siv tau ntau dua nyob rau hauv qee qhov kub thiab txias (xws li kev ua zaub mov thiab tshuaj).
4. Cov yam ntxwv viscosity
Viscosity ntawm MC: Methyl cellulose muaj viscosity ntau dua nyob rau hauv aqueous tov thiab feem ntau yog siv nyob rau hauv lub sij hawm uas siab viscosity yuav tsum tau, xws li thickeners, emulsifiers, thiab lwm yam. Nws viscosity yog ze ze rau concentration, kub thiab degree ntawm methylation. Ib qib siab dua ntawm methylation yuav ua rau kom muaj viscosity ntawm cov tshuaj.
Viscosity ntawm HPMC: Lub viscosity ntawm HPMC feem ntau yog me ntsis qis dua li ntawm MC, tab sis vim nws cov dej solubility ntau dua thiab txhim kho thermal stability, HPMC yog qhov zoo tshaj plaws dua li MC hauv ntau lub sijhawm uas yuav tsum muaj kev tswj viscosity zoo dua. Lub viscosity ntawm HPMC cuam tshuam los ntawm qhov hnyav molecular, kua concentration thiab dissolution kub.
5. Qhov txawv ntawm daim ntawv thov teb
Daim ntawv thov ntawm MC: Methyl cellulose yog siv dav hauv kev tsim kho, txheej txheej, kev ua zaub mov, tshuaj, tshuaj pleev ib ce thiab lwm yam. Tshwj xeeb tshaj yog nyob rau hauv kev tsim kho, nws yog ib qho khoom siv hauv tsev ntau ntxiv siv rau thickening, txhim kho adhesion thiab txhim kho kev tsim kho. Hauv kev lag luam khoom noj khoom haus, MC tuaj yeem siv ua cov thickener, emulsifier thiab stabilizer, thiab feem ntau pom muaj nyob rau hauv cov khoom xws li jelly thiab ice cream.
Daim ntawv thov ntawm HPMC: HPMC yog dav siv nyob rau hauv kws tshuaj, khoom noj khoom haus, kev tsim kho, tshuaj pleev ib ce thiab lwm yam lag luam vim nws zoo heev solubility thiab thermal stability. Hauv kev lag luam kws tshuaj, HPMC feem ntau yog siv los ua ib qho ntxiv rau cov tshuaj, tshwj xeeb tshaj yog nyob rau hauv qhov ncauj npaj, raws li ib tug zaj duab xis qub, thickener, sustained-tso tus neeg saib xyuas, thiab lwm yam. Nyob rau hauv lub lag luam khoom noj khoom haus, HPMC yog siv raws li ib tug thickener thiab emulsifier rau cov zaub mov uas tsis muaj calorie ntau ntau, thiab yog dav siv nyob rau hauv cov khoom noj zaub nyoos, cov khoom noj khov thiab lwm yam khoom.
6. Kev sib piv ntawm lwm yam khoom
Transparency: HPMC cov kev daws teeb meem feem ntau muaj cov pob tshab siab, yog li lawv tsim nyog rau cov ntawv thov uas xav tau lub pob tshab lossis pob tshab. MC cov kev daws teeb meem feem ntau yog turbid.
Biodegradability thiab kev nyab xeeb: Ob leeg muaj biodegradability zoo, tuaj yeem raug degraded los ntawm ib puag ncig nyob rau hauv tej yam kev mob, thiab raug suav hais tias muaj kev nyab xeeb hauv ntau daim ntawv thov.
HPMCthiabMCyog ob yam khoom uas tau txais los ntawm kev hloov kho cellulose thiab muaj cov qauv yooj yim zoo sib xws, tab sis lawv muaj qhov sib txawv loj hauv solubility, thermal stability, viscosity, transparency, thiab daim ntawv thov. HPMC muaj cov dej solubility zoo dua, thermal stability, thiab pob tshab, yog li nws yog qhov tsim nyog rau lub sijhawm uas yuav tsum tau tawg sai, thermal stability, thiab tsos. MC yog dav siv nyob rau hauv lub sij hawm uas yuav tsum tau siab viscosity thiab siab stability vim nws siab viscosity thiab zoo thickening nyhuv.
Post lub sij hawm: Apr-06-2025