HPMC (HydroxyPropyyl methylulose) yog cov cellulose celluluced etheric ether petalume, siv thiab tshuaj pleev ib ce. Cov qib sib txawv ntawm HPMC feem ntau yog cais raws li lawv cov tshuaj lom neeg cov tshuaj, cov khoom siv lub cev, viscosity hloov chaw thiab qib siv.
1.. Cov qauv siv tshuaj lom neeg thiab qib hloov chaw
Cov qauv molecular ntawm HPMC muaj cov pab pawg hydroxyl ntawm lub cellulose saw raug hloov los ntawm methoxy thiab hydroxypropoxy pawg. Lub cev nqaij daim tawv thiab tshuaj lom neeg ntawm HPMC sib txawv nyob ntawm cov degree hloov chaw ntawm methoxy thiab hydroxypropoxy pawg. Cov qib degree hloov kho cov solubility, thermal stability thiab cov kev ua si saum npoo HPMC. Tshwj xeeb:
HPMC nrog cov ntsiab lus methoxy siab yuav ua rau muaj txiaj ntsig ntau dua rau cov ntawv thov kub kom haum xws li kev npaj tshuaj kev npaj tshuaj.
HPMC nrog lub siab hydroxypropoxy cov ntsiab lus muaj solubility zoo dua, ua rau nws muaj kev haum rau kev siv hauv ib puag ncig txias.
2. Viscosity qib
Viscosity yog ib qho ntawm cov ntsuas tseem ceeb ntawm HPMC qib. HPMC muaj ntau hom viscosities, los ntawm ob peb centipoise mus rau kaum ntawm txhiab tus centipoise. Qib qib viscosity cuam tshuam nws siv nyob rau hauv cov ntawv thov sib txawv:
Tsis muaj viscosity HPMC (xws li 10-100 centipoise): Cov kab mob HPMC yog feem ntau, xws li cov tshuaj pleev xim zoo nkauj, thiab lwm yam tuaj yeem muab cov lus qhia ua ntej ntawm kev sib raug zoo tsis muaj kev cuam tshuam Lub fluidity ntawm kev npaj.
Nruab nrab viscosity HPMC (xws li 100-1000 centipoise): feem ntau siv nyob rau hauv cov zaub mov, kev npaj tshuaj, nws tuaj yeem ua raws li cov ntaub ntawv thiab txhim kho cov qauv thiab ruaj khov ntawm cov khoom.
High viscosity HPMC (xws li saum 1000 Centipoise): Cov qhab nia ntawm HPMC feem ntau yog siv cov kab mob siab, xws li cov nyom, cov khoom nplaum thiab cov khoom siv hauv tsev. Lawv muab cov tshuaj ua kom zoo tshaj plaws thiab ncua kev tshem tawm.
3. Lub cev lub cev
Lub zog ntawm lub cev ntawm HPMC, xws li solubility, gelation ntsuas kub, thiab dej nqus qhov muaj peev xwm, kuj sib txawv nrog nws qib:
Solubility: Feem ntau HPMC muaj cov solubility zoo hauv dej txias, tab sis cov solubility txo cov ntsiab lus methoxy nce. Qee cov qhab nia tshwj xeeb ntawm HPMC kuj tuaj yeem ua kom yaj nyob rau hauv cov txheej txheem organic rau cov kev siv cov kev lag luam tshwj xeeb.
Gelation kub: lub gelation kub ntawm HPMC nyob rau hauv cov kua aqueous sib txawv nrog hom thiab cov ntsiab lus hloov chaw. Feem ntau hais lus, HPMC nrog cov ntsiab lus methoxy siab los ua cov tshuaj pleev qhov kub siab dua, thaum HPMC nrog lub siab hydroxyprropoxy cov ntsiab lus tseem ceeb rau qhov qis qis dua gelation kub.
Hygroscopicity: HPMC muaj cov qib qis, tshwj xeeb tshaj yog cov qib siab muaj txiaj ntsig. Qhov no ua rau nws zoo heev nyob rau hauv ib puag ncig uas yuav tsum muaj noo noo tsis kam.
4. Daim ntawv thov Thaj Chaw
Vim tias cov qhab nia sib txawv ntawm HPMC nyias muaj nyias lub cev thiab tshuaj siv tshuaj, lawv cov ntawv thov hauv ntau daim teb kuj txawv:
Kws Kev Lag Luam: HPMC feem ntau siv nyob rau hauv cov ntsiav tshuaj pleev xim, kev npaj kom muaj kev npaj-tso tawm, cov nplaum, thiab tuab. Kws Tshuaj HPMC yuav tsum ua kom tau raws li cov chaw muag tshuaj uas muaj chaw muag tshuaj (EP), EP), EP), EP), ENP), EP)
Kev lag luam khoom noj: HPMC yog siv los ua cov tuab tuab, emulsifier, stabilizer thiab zaj duab xis yav tas los. Khoom Noj Khoom Noj Qib HPMC feem ntau yuav tsum tau tsis muaj tshuaj lom neeg, xws li cov neeg noj zaub mov noj dawb, thiab tshuaj noj mov (EFSA).
Kev Lag Luam Kev Siv Tsim Kho: HPMC feem ntau yog siv hauv cov khoom siv Maas-based, gypsum cov khoom lag luam thiab cov xim ua kom tuab, tuav dej thiab txhim kho. HPMC ntawm cov qib viscosity sib txawv tuaj yeem cuam tshuam rau kev ua haujlwm ntawm cov ntaub ntawv tsim tsev thiab kev ua haujlwm ntawm cov khoom kawg.
5. Cov Qauv Zoo thiab Cov Cai
Cov qib sib txawv ntawm HPMC kuj tseem raug rau cov qauv zoo thiab cov cai:
Kws Tshuaj HPMC: Yuav tsum muaj raws li cov chaw muag tshuaj, xws li USP, thiab lwm yam kev nyab xeeb yog qhov siab ntau yam kev nyab xeeb thiab ua tau zoo hauv chaw tsim khoom.
Cov khoom noj-qib HPMC: nws yuav tsum ua raws li cov kev cai ntawm cov zaub mov ntxiv kom ntseeg tau tias nws muaj kev nyab xeeb hauv cov zaub mov. Cov teb chaws sib txawv thiab cov cheeb tsam yuav muaj cov specifications sib txawv rau cov khoom noj-qib HPMC.
Industrial-qib HPMC: HPMC siv hauv kev tsim kho, cov xim hlau thiab lwm thaj chaw feem ntau tsis tas yuav ua kom tau cov qauv khoom noj lossis cov qauv tshuaj, xws li ISO cov qauv.
6. Kev Nyab Xeeb Kev Nyab Xeeb thiab ib puag ncig
HPMC ntawm cov qib sib txawv kuj sib txawv hauv kev tiv thaiv kev nyab xeeb thiab ib puag ncig. Kws tsim khoom-qib HPMC feem ntau raug cov kev ntsuas kev nyab xeeb kom ntseeg tau tias lawv tsis muaj teeb meem rau tib neeg lub cev. Industrial-Qib HPMC, ntawm qhov tod tes, them ntau dua rau nws cov kev tiv thaiv ib puag ncig thiab tsis yeem ntawm kev siv rau ib puag ncig.
Qhov sib txawv ntawm cov qib sib txawv ntawm HPMC yog xav txog hauv cov qauv tshuaj lom neeg, cov khoom siv lub cev, cov qauv kev thov, cov qauv kev thov, cov qauv kev thov thiab kev nyab xeeb. Raws li cov ntawv thov yuav tsum tau xaiv cov kev thov ntawm HPMC tuaj yeem txhim kho kev ua tau zoo thiab kev ua tau zoo. Thaum kev yuav HPMC, cov xwm txheej no yuav tsum txiav txim siab kom ntseeg tau tias qhov kev siv tau thiab ua haujlwm tau zoo.
Lub Sijhawm Post: Lub Yim Hli 20-2024