HydroxyPropyyl methylcellueculose (HPMC) yog cov khoom siv polymer ntau yam hauv kev lag luam los ntawm cov kws tshuaj los tsim kho vim nws cov khoom ntiag tug. Nws yog ib pawg cellulose, nrog cov pab pawg hydroxyl hloov los ntawm methoxy thiab hydroxyprropyl, txhim kho nws solubility hauv dej thiab qee cov kuab tshuaj organic.
Solubility Cov yam ntxwv ntawm HPMC
1. Dej Solubility
HPMC yog feem ntau dej-soluble. Nws solubility hauv dej yog cuam tshuam los ntawm ntau yam:
Qhov kub thiab txias: HPMC tau ploj hauv dej txias lossis chav tsev-kub. Thaum cua sov, HPMC yuav ua tau ib tug gel; Txog txias, tus gel yaj dua, ua rau nws thim rov qab. Qhov no thermal gelation yog pab tau nyob rau hauv cov ntawv thov nyiam tswj tshuaj yeeb hauv cov chaw ua tshuaj.
Concentration: cov kev ua kom tsawg (0.5-2%) feem ntau yaj tau ntau dua. Cov kev cuam tshuam ntau dua (txog li 10%) yuav xav tau ntau stirring thiab lub sijhawm.
PH: HPMC cov kev daws teeb meem yog ruaj khov thoob plaws ntau (3-11), ua rau lawv ntau yam hauv cov qauv sib txawv.
2. OrgicS cov kuab tshuaj
Thaum lub sij hawm feem ntau cov dej-soluble, HPMC kuj tseem tuaj yeem ploj hauv qee cov kuab tshuaj organic, tshwj xeeb yog cov muaj qee qib polar. Cov no suav nrog:
Cawv: HPMC qhia zoo sudubility hauv cov cawv me li methanol, ethanol, thiab isopropanol. Cov dej cawv ntau dua yog tsawg dua vim lawv cov hlua hydrophlomic ntev.
Glycols: Propylene Glycol thiab Polyethylene Glycol (Peg) tuaj yeem yaj HPMC. Cov kuab tshuaj no feem ntau siv hauv kev sib xyaw nrog dej lossis dej cawv txhawm rau txhim kho solubility thiab daws teeb meem ruaj khov.
Ketones: qee yam ketones xws li acetone thiab methyl ketyl ketne ethyl ketone tuaj yeem yaj HPMC, tshwj xeeb tshaj yog thaum tov nrog dej.
3. Mixtures
HPMC kuj tseem tuaj yeem yog yaj hauv cov kuab tshuaj sib xyaw. Piv txwv, sib txuas cov dej nrog dej cawv lossis glycols tuaj yeem txhim kho solubility. Lub synergy ntawm cov kuab tshuaj tuaj yeem txo qis qhov yuav tsum muaj ntawm ib qho kev daws teeb meem nkaus xwb, xav paub txog kev ua kom paub tseeb.
Mechanism ntawm kev xaus
Kev sib cais ntawm HPMC nyob rau hauv cov kuab tshuaj cuam tshuam nrog tawg cov zog hauv HPMC ntawm HPMC saw thiab ua cov kev sib cuam tshuam tshiab nrog cov kuab tshuaj molecules. Yam uas cuam tshuam cov txheej txheem no suav nrog:
Hydrogen Kev Ua Haujlwm: HPMC cov ntaub ntawv Hydrogen Bonds nrog dej thiab lwm cov kuab tshuaj polar, muab cov solubility.
Polymer-kev sib cuam tshuam: Muaj peev xwm ntawm cov kuab tshuaj molecules mus rau nkag mus thiab cuam tshuam nrog HPMC chains cuam tshuam kev ua tiav kev ua tau zoo.
Cov kev ntseeg ua haujlwm: Cuam Tshuam yuav pab ua kom tawg txog kev sib xyaw ua ke thiab txhawb nqa cov khaub ncaws tsis sib xws.
Cov kev saib xyuas tswv yim rau kev ua tiav HPMC
1. Txoj kev sib cais
Rau kev ua kom tau zoo, ua raws cov kauj ruam no:
Maj mam ntxiv: maj mam ntxiv HPMC mus rau cov kuab tshuaj nrog tas li stirring kom tsis txhob muaj clumping.
Tswj kub: yaj HPMC hauv dej txias kom tsis txhob ntxov ntxov. Rau qee cov kuab tshuaj organic, ua kom sov me tuaj yeem pab tau.
Kev sib xyaw ua ke: siv cov neeg kho mob stirrers lossis homogenizers rau kev sib xyaw ua tau zoo, tshwj xeeb tshaj yog nyob rau ntau dua.
2. Lub siab thiab viscosity
HPMC lub concentration cuam tshuam cov viscosity ntawm kev daws:
Qes concentration: ua rau muaj kev daws teeb meem tsawg, haum rau cov ntawv thov zoo li txheej txheej lossis binders.
Kev siab siab: Tsim cov kev daws teeb meem siab lossis gel, muaj txiaj ntsig hauv cov tshuaj ntawm cov tshuaj rau kev tso tawm.
3. Sib txuam
Thaum siv HPMC nyob rau hauv cov qauv, xyuas kom haum nrog lwm cov khoom xyaw:
PE stability: Txheeb xyuas tias lwm cov Cheebtsam tsis hloov lub p pH dhau qhov ntau ntawm cov chaw HPMC rau HPMC.
Qhov kub thiab txias rhiab: Xav txog cov khoom cua thermal gelation thaum tsim cov txheej txheem uas cuam tshuam nrog qhov kub hloov.
Cov ntawv thov ntawm HPMC daws teeb meem
HPMC cov kev daws teeb meem yog ua haujlwm hla kev kev lag luam vim lawv cov khoom muaj txiaj ntsig:
1. Kws ua tshuaj
HPMC ua raws li cov phau ntawv, zaj duab xis yav tas los, thiab tswj cov tso cai tso tawm:
Cov ntsiav tshuaj thiab cov tshuaj ntsiav: HPMC cov kev daws teeb meem pab hauv cov khoom xyaw thiab kev sib sau ua yeeb yaj kiab tso tawm.
Gels: Siv nyob rau hauv cov ntsiab lus sau rau nws cov thickening thiab ruaj khov.
2. Kev lag luam khoom noj khoom haus
Raws li cov zaub mov ntxiv, HPMC yog siv rau nws cov stabilizing thiab emulsifyifying carerties:
Thickeners: txhim kho kev ntxhib los mos thiab ruaj khov hauv cov kua thiab hnav khaub ncaws.
Zaj duab xis tsim: tsim cov yeeb yaj kiab uas muaj cov khoom siv tau rau cov txheej txheem thiab cov ntsiab lus.
3. Kev tsim kho
HPMC cov kev daws teeb meem txhim kho cov khoom siv ntawm cov khoom siv kev tsim kho:
Cement thiab tshuaj khib: Siv los ua cov tuab thiab dej rov qab los saib xyuas cov khoom noj.
Xim thiab pleev xim: muab rheator tswj thiab ruaj khov nyob rau hauv cov xim tha xim.
Kawm Txuj Ci Ntau Dua
1. Ultrasonication
Kev siv ultrasonic vuam kom yaj HPMC tuaj yeem txhim kho kev sib cais thiab kev ua tau zoo los ntawm kev sib cais thiab kev txhawb nqa cov kev sib cais.
2. High-shear sib xyaw
High-shear mixers muab kev sib xyaw hnyav, txo cov kev txiav txim siab thiab txhim kho homogeneity, tshwj xeeb hauv cov qauv siab-viscosity.
Ib puag ncig thiab kev txiav txim siab nyab xeeb
1. Biodegradistability
HPMC yog biodegradable, ua rau nws ib puag ncig phooj ywg. Nws degrades rau hauv ntuj sib txuas, txo kev cuam tshuam ib puag ncig ib puag ncig.
2. Kev Nyab Xeeb
HPMC yog tsis muaj tshuaj lom thiab muaj kev nyab xeeb rau kev siv hauv cov zaub mov, chaw muag tshuaj, thiab tshuaj pleev ib ce. Txawm li cas los xij, cov ntawv qhia kev nyab xeeb (SDS) yuav tsum tau saib xyuas rau kev tuav thiab khaws cov lus qhia.
Dissolving HPMC muaj txiaj ntsig zoo yuav tsum tau kev nkag siab nws cov yam ntxwv solubility thiab cov kev sib txawv nrog cov kuab tshuaj sib txawv. Cov dej tseem yog thawj cov kuab tshuaj, thaum dej cawv, glycols, thiab cov kuab tshuaj tov cov kev daws teeb meem rau cov ntawv thov tshwj xeeb. Cov tswv yim tsim nyog thiab kev txiav txim siab ua kom muaj kev xaus, ua kom zoo HPMC ntau yam siv ntau yam kev lag luam.
Lub Sijhawm Post: Jun-14-2024